0000822818-20-000027 | 10-Q | XBRL Viewer

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Cover - shares	9 Months Ended
Cover - shares	Sep. 30, 2020	Oct. 30, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-34223
Entity Registrant Name	CLEAN HARBORS, INC
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	04-2997780
Entity Address, Address Line One	42 Longwater Drive
Entity Address, City or Town	Norwell
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02061-9149
City Area Code	781
Local Phone Number	792-5000
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	CLH
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		55,246,298
Entity Central Index Key	0000822818
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 475,706	$ 371,991
Short-term marketable securities	56,639	42,421
Accounts receivable, net of allowances aggregating $41,714 and $38,711, respectively	602,069	644,738
Unbilled accounts receivable	59,438	56,326
Deferred costs	20,212	21,746
Inventories and supplies	220,884	214,744
Prepaid expenses and other current assets	58,711	48,942
Total current assets	1,493,659	1,400,908
Property, plant and equipment, net	1,539,333	1,588,151
Other assets:
Operating lease right-of-use assets	146,454	162,206
Goodwill	524,261	525,013
Permits and other intangibles, net	392,401	419,066
Other	10,079	13,560
Total other assets	1,073,195	1,119,845
Total assets	4,106,187	4,108,904
Current liabilities:
Current portion of long-term obligations	7,535	7,535
Accounts payable	213,776	298,375
Deferred revenue	67,412	73,370
Accrued expenses	293,200	276,540
Current portion of closure, post-closure and remedial liabilities	22,324	23,301
Current portion of operating lease liabilities	36,814	40,979
Total current liabilities	641,061	720,100
Other liabilities:
Closure and post-closure liabilities, less current portion of $7,146 and $7,283, respectively	77,070	68,368
Remedial liabilities, less current portion of $15,178 and $16,018, respectively	100,389	98,155
Long-term obligations, less current portion	1,550,756	1,554,116
Operating lease liabilities, less current portion	110,097	121,020
Deferred taxes, unrecognized tax benefits and other long-term liabilities	322,099	277,332
Total other liabilities	2,160,411	2,118,991
Commitments and contingent liabilities (See Note 16)
Stockholders’ equity:
Common stock, $0.01 par value: authorized 80,000,000 shares; issued and outstanding 55,245,611 and 55,797,734 shares, respectively	552	558
Additional paid-in capital	613,208	644,412
Accumulated other comprehensive loss	(239,444)	(210,051)
Accumulated earnings	930,399	834,894
Total stockholders’ equity	1,304,715	1,269,813
Total liabilities and stockholders’ equity	$ 4,106,187	$ 4,108,904
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, issued shares (in shares)	55,245,611	55,797,734

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Account receivable, allowances aggregating	$ 41,714	$ 38,711
Closure and post-closure liabilities, current portion	7,146	7,283
Remedial liabilities, current portion	$ 15,178	$ 16,018
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	80,000,000	80,000,000
Common stock, issued shares (in shares)	55,245,611	55,797,734
Common stock, outstanding shares (in shares)	55,245,611	55,797,734

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Total revenues	$ 779,344	$ 891,668	$ 2,347,907	$ 2,541,185
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	511,629	612,754	1,588,976	1,772,051
Selling, general and administrative expenses	106,544	122,301	339,690	361,033
Accretion of environmental liabilities	2,822	2,490	8,149	7,624
Depreciation and amortization	74,470	73,756	221,497	223,328
Income from operations	83,879	80,367	189,595	177,149
Other income (expense), net	2,268	(427)	(597)	1,992
Loss on sale of businesses	(118)	0	(3,376)	0
Loss on early extinguishment of debt	0	(6,119)	0	(6,119)
Interest expense, net of interest income of $1,236, $1,152, $2,902 and $2,981, respectively	(17,407)	(19,702)	(54,848)	(59,681)
Income before provision for income taxes	68,622	54,119	130,774	113,341
Provision for income taxes	13,712	17,750	35,269	39,752
Net income	$ 54,910	$ 36,369	$ 95,505	$ 73,589
Earnings Per Share [Abstract]
Basic (in USD per share)	$ 0.99	$ 0.65	$ 1.72	$ 1.32
Diluted (in USD per share)	$ 0.99	$ 0.65	$ 1.71	$ 1.31
Shares used to compute earnings per share - Basic (in shares)	55,592	55,850	55,646	55,858
Shares used to compute earnings per share - Diluted (in shares)	55,738	56,165	55,832	56,109
Service revenues
Revenues:
Total revenues	$ 681,306	$ 739,919	$ 2,039,012	$ 2,111,662
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	428,735	496,005	1,332,516	1,439,717
Product revenues
Revenues:
Total revenues	98,038	151,749	308,895	429,523
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	$ 82,894	$ 116,749	$ 256,460	$ 332,334

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Interest income	$ 1,236	$ 1,152	$ 2,902	$ 2,981

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 54,910	$ 36,369	$ 95,505	$ 73,589
Other comprehensive income (loss), net of tax:
Unrealized (losses) gains on available-for-sale securities	(121)	9	111	(84)
Reclassification adjustment for losses on available-for-sale securities included in net income	0	0	0	332
Unrealized loss on interest rate hedge	(123)	(3,865)	(21,505)	(17,896)
Reclassification adjustment for losses on interest rate hedge included in net income	2,468	614	5,696	1,369
Foreign currency translation adjustments	10,161	(6,177)	(13,695)	15,960
Other comprehensive income (loss), net of tax	12,385	(9,419)	(29,393)	(319)
Comprehensive income	$ 67,295	$ 26,950	$ 66,112	$ 73,270

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 95,505	$ 73,589
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	221,497	223,328
Allowance for doubtful accounts	10,441	(745)
Amortization of deferred financing costs and debt discount	2,688	2,908
Accretion of environmental liabilities	8,149	7,624
Changes in environmental liability estimates	9,050	(585)
Deferred income taxes	0	(973)
Other expense (income), net	597	(1,992)
Stock-based compensation	12,739	14,664
Loss on sale of businesses	3,376	0
Loss on early extinguishment of debt	0	6,119
Environmental expenditures	(8,816)	(12,804)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable and unbilled accounts receivable	23,969	(31,408)
Inventories and supplies	(9,554)	(11,982)
Other current and non-current assets	(19,320)	(5,425)
Accounts payable	(63,898)	3,035
Other current and long-term liabilities	31,009	19,322
Net cash from operating activities	317,432	284,675
Cash flows used in investing activities:
Additions to property, plant and equipment	(150,357)	(174,533)
Proceeds from sale and disposal of fixed assets	7,307	8,948
Acquisitions, net of cash acquired	(8,839)	(29,479)
Proceeds from sale of businesses, net of transactional costs	7,712	0
Additions to intangible assets including costs to obtain or renew permits	(1,863)	(2,896)
Proceeds from sale of available-for-sale securities	39,141	41,612
Purchases of available-for-sale securities	(53,397)	(30,761)
Net cash used in investing activities	(160,296)	(187,109)
Cash flows used in financing activities:
Change in uncashed checks	381	(3,516)
Tax payments related to withholdings on vested restricted stock	(4,407)	(5,505)
Repurchases of common stock	(39,542)	(16,390)
Deferred financing costs paid	0	(10,053)
Premiums paid on early extinguishment of debt	0	(2,689)
Payments on finance leases	(2,755)	(327)
Principal payments on debt	(5,652)	(850,652)
Issuance of unsecured senior notes	0	845,000
Borrowing from revolving credit facility	150,000	0
Payment on revolving credit facility	(150,000)	0
Net cash used in financing activities	(51,975)	(44,132)
Effect of exchange rate change on cash	(1,446)	2,292
Increase in cash and cash equivalents	103,715	55,726
Cash and cash equivalents, beginning of period	371,991	226,507
Cash and cash equivalents, end of period	475,706	282,233
Cash payments for interest and income taxes:
Interest paid	66,000	52,440
Income taxes paid, net of refunds	14,195	23,797
Non-cash investing activities:
Property, plant and equipment accrued	11,732	14,875
ROU assets obtained in exchange for operating lease liabilities	19,993	8,008
ROU assets obtained in exchange for finance lease liabilities	$ 28,333	$ 31,011

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Increase (Decrease) in Stockholders' Equity
Common stock, par value (in USD per share)	$ 0.01
Balance beginning of period (in shares) at Dec. 31, 2018		55,847
Balance beginning of period at Dec. 31, 2018	$ 1,169,756	$ 558	$ 655,415	$ (223,371)	$ 737,154
Increase (Decrease) in Stockholders' Equity
Net income	976				976
Other comprehensive (loss) income	4,024			4,024
Stock-based compensation	5,809		5,809
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares)		78
Issuance of common stock for restricted share vesting, net of employee tax withholdings	(2,276)	$ 1	(2,277)
Repurchases of common stock (in shares)		(97)
Repurchases of common stock	(6,324)	$ (1)	(6,323)
Balance ending of period (in shares) at Mar. 31, 2019		55,828
Balance ending of period at Mar. 31, 2019	1,171,965	$ 558	652,624	(219,347)	738,130
Balance beginning of period (in shares) at Dec. 31, 2018		55,847
Balance beginning of period at Dec. 31, 2018	1,169,756	$ 558	655,415	(223,371)	737,154
Increase (Decrease) in Stockholders' Equity
Net income	73,589
Other comprehensive (loss) income	(319)
Balance ending of period (in shares) at Sep. 30, 2019		55,808
Balance ending of period at Sep. 30, 2019	$ 1,235,795	$ 558	648,184	(223,690)	810,743
Increase (Decrease) in Stockholders' Equity
Common stock, par value (in USD per share)	$ 0.01
Balance beginning of period (in shares) at Mar. 31, 2019		55,828
Balance beginning of period at Mar. 31, 2019	$ 1,171,965	$ 558	652,624	(219,347)	738,130
Increase (Decrease) in Stockholders' Equity
Net income	36,244				36,244
Other comprehensive (loss) income	5,076			5,076
Stock-based compensation	3,834		3,834
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares)		105
Issuance of common stock for restricted share vesting, net of employee tax withholdings	(2,704)	$ 1	(2,705)
Repurchases of common stock (in shares)		(74)
Repurchases of common stock	(4,948)		(4,948)
Balance ending of period (in shares) at Jun. 30, 2019		55,859
Balance ending of period at Jun. 30, 2019	$ 1,209,467	$ 559	648,805	(214,271)	774,374
Increase (Decrease) in Stockholders' Equity
Common stock, par value (in USD per share)	$ 0.01
Net income	$ 36,369				36,369
Other comprehensive (loss) income	(9,419)			(9,419)
Stock-based compensation	5,021		5,021
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares)		17
Issuance of common stock for restricted share vesting, net of employee tax withholdings	(525)		(525)
Repurchases of common stock (in shares)		(68)
Repurchases of common stock	(5,118)	$ (1)	(5,117)
Balance ending of period (in shares) at Sep. 30, 2019		55,808
Balance ending of period at Sep. 30, 2019	$ 1,235,795	$ 558	648,184	(223,690)	810,743
Increase (Decrease) in Stockholders' Equity
Common stock, par value (in USD per share)	$ 0.01
Common stock, par value (in USD per share)	$ 0.01
Balance beginning of period (in shares) at Dec. 31, 2019		55,798
Balance beginning of period at Dec. 31, 2019	$ 1,269,813	$ 558	644,412	(210,051)	834,894
Increase (Decrease) in Stockholders' Equity
Net income	11,572				11,572
Other comprehensive (loss) income	(59,306)			(59,306)
Stock-based compensation	3,291		3,291
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares)		59
Issuance of common stock for restricted share vesting, net of employee tax withholdings	(2,224)	$ 1	(2,225)
Repurchases of common stock (in shares)		(302)
Repurchases of common stock	(17,341)	$ (3)	(17,338)
Balance ending of period (in shares) at Mar. 31, 2020		55,555
Balance ending of period at Mar. 31, 2020	1,205,805	$ 556	628,140	(269,357)	846,466
Balance beginning of period (in shares) at Dec. 31, 2019		55,798
Balance beginning of period at Dec. 31, 2019	1,269,813	$ 558	644,412	(210,051)	834,894
Increase (Decrease) in Stockholders' Equity
Net income	95,505
Other comprehensive (loss) income	(29,393)
Balance ending of period (in shares) at Sep. 30, 2020		55,246
Balance ending of period at Sep. 30, 2020	$ 1,304,715	$ 552	613,208	(239,444)	930,399
Increase (Decrease) in Stockholders' Equity
Common stock, par value (in USD per share)	$ 0.01
Balance beginning of period (in shares) at Mar. 31, 2020		55,555
Balance beginning of period at Mar. 31, 2020	$ 1,205,805	$ 556	628,140	(269,357)	846,466
Increase (Decrease) in Stockholders' Equity
Net income	29,023				29,023
Other comprehensive (loss) income	17,528			17,528
Stock-based compensation	2,786		2,786
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares)		58
Issuance of common stock for restricted share vesting, net of employee tax withholdings	(1,171)		(1,171)
Balance ending of period (in shares) at Jun. 30, 2020		55,613
Balance ending of period at Jun. 30, 2020	$ 1,253,971	$ 556	629,755	(251,829)	875,489
Increase (Decrease) in Stockholders' Equity
Common stock, par value (in USD per share)	$ 0.01
Net income	$ 54,910				54,910
Other comprehensive (loss) income	12,385			12,385
Stock-based compensation	6,662		6,662
Issuance of common stock for restricted share vesting, net of employee tax withholdings (in shares)		35
Issuance of common stock for restricted share vesting, net of employee tax withholdings	(1,012)		(1,012)
Repurchases of common stock (in shares)		(402)
Repurchases of common stock	(22,201)	$ (4)	(22,197)
Balance ending of period (in shares) at Sep. 30, 2020		55,246
Balance ending of period at Sep. 30, 2020	$ 1,304,715	$ 552	$ 613,208	$ (239,444)	$ 930,399
Increase (Decrease) in Stockholders' Equity
Common stock, par value (in USD per share)	$ 0.01

BASIS OF PRESENTATION	9 Months Ended
BASIS OF PRESENTATION	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying consolidated interim financial statements are unaudited and include the accounts of Clean Harbors, Inc. and its subsidiaries (collectively, “Clean Harbors,” the “Company” or "we") and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) and, in the opinion of management, include all adjustments which are of a normal recurring nature and are necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented. Management has made estimates and assumptions affecting the amounts reported in the Company's consolidated interim financial statements and accompanying footnotes; actual results could differ from those estimates and judgments. The results for interim periods are not necessarily indicative of results for the entire year or any other interim periods. The financial statements presented herein should be read in conjunction with the financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. A novel strain of coronavirus ("COVID-19") was first identified in December 2019, and subsequently declared a global pandemic by the World Health Organization on March 11, 2020. As a result of the outbreak, many companies have experienced disruptions in their operations, workforce and markets served, including a significant reduction in the demand for petroleum-based products. The Company's businesses and operations began being adversely impacted by effects of COVID-19 in March of 2020 when circumstances surrounding and responses to the pandemic, including stay-at-home orders, began to materialize in North America. These disruptions have had a significant impact on the Company's operating results since then, and the Company expects that operations will continue to be impacted. The full extent of the ongoing COVID-19 outbreak and changes in demand for oil and the impact on the Company’s operations is uncertain. A prolonged disruption could have a material adverse impact on financial results and business operations of the Company. In response to the COVID-19 outbreak, the Company has seen increased demand in emergency response decontamination services related to the coronavirus. In particular, the Company is addressing the safety of its customers and communities by providing contagion decontamination services. In conducting these services, employee safety is paramount and the Company has been able to provide appropriate personal protective equipment and support to those performing these services.

SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
SIGNIFICANT ACCOUNTING POLICIES	Sep. 30, 2020
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES The Company's significant accounting policies are described in Note 2, "Significant Accounting Policies," in the Company's Annual Report on Form 10-K for the year ended December 31, 2019. There have been no material changes in these policies or their application except for the changes described below. Landfill Accounting Landfill capacity - During the first nine months of 2020, the Company has taken actions to begin the closure of one of the Company's commercial landfill sites. The planned closure will nominally reduce the Company's remaining highly probable airspace. See Note 9, "Closure and Post-Closure Liabilities," for additional information. Government Grants On March 27, 2020, the Coronavirus Aid, Relief and Economic Security Act ("CARES Act") was signed into law in response to the widespread economic impact of the COVID-19 pandemic. On April 11, 2020, the Canadian federal government enacted the COVID-19 Emergency Response Act, No.2, which implemented the Canada Emergency Wage Subsidy ("CEWS"). During the three and nine months ended September 30, 2020, the Company recorded benefits of $13.3 million and $36.7 million, respectively, as an offset to the related operating expenses in either cost of revenues or selling, general and administrative expenses for the eligible employee retention credit under the CARES Act and the subsidy under CEWS. The benefits received under these government sponsored programs do not require repayment.

REVENUES

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

REVENUES

The Company generates revenues through its Environmental Services and Safety-Kleen operating segments. The Company's Environmental Services operating segment generally has the following three sources of revenue:

Technical Services—Technical Services revenues are generated from fees charged for waste material management and disposal services including onsite environmental management services, collection and transportation, packaging, recycling, treatment

and disposal of waste. Revenue is primarily generated by short-term projects, most of which are governed by master service agreements that are long-term in nature. These master service agreements are typically entered into with the Company's larger customers and outline the pricing and legal frameworks for such arrangements. Services are provided based on purchase orders or agreements with the customer and include prices based upon units of volume of waste and transportation and other fees. Collection and transportation revenues are recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. Revenues for treatment and disposal of waste are recognized upon completion of treatment, final disposition in a landfill or incineration, or when the waste is shipped to a third party for processing and disposal. The Company periodically enters into bundled arrangements for the collection and transportation and disposal of waste. For such arrangements, transportation and disposal are considered distinct performance obligations and the Company allocates revenue to each based on the relative standalone selling price (i.e., the estimated price that a customer would pay for the services on a standalone basis). Revenues from waste that is not yet completely processed and disposed and the related costs are deferred. The deferred revenues and costs are recognized when the related services are completed. The period between collection and transportation and the final processing and disposal ranges depending on the location of the customer, but generally is measured in days.

Field and Emergency Response Services—Field Services revenues are generated from cleanup services at customer sites, including municipalities and utilities, or other locations on a scheduled or emergency response basis. Services include confined space entry for tank cleaning, site decontamination, large remediation projects, demolition, spill cleanup on land and water, railcar cleaning, product recovery and transfer and vacuum services. Additional services include filtration and water treatment services. Response services for environmental, contamination or pandemic related emergencies include any scale from man-made disasters such as oil spills, to natural disasters such as hurricanes. More recently demand has increased for projects involving contagion disinfection, decontamination and disposal services in response to the COVID-19 pandemic. Field and emergency response services are provided based on purchase orders or agreements with customers and include prices generally based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the service as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. The duration of such services can be over a number of hours, several days or even months for larger scale projects.

Industrial Services and Other—Industrial Services revenues are primarily generated from industrial and specialty services provided to refineries, mines, upgraders, chemical plants, pulp and paper mills, manufacturing facilities, power generation facilities and other industrial customers throughout North America. Services include in-plant cleaning and maintenance services, plant outage and turnaround services, decoking and pigging, chemical cleaning, high and ultra-high pressure water cleaning, pipeline inspection and coating services, large tank and surface impoundment cleaning, oilfield transport, daylighting, production services and upstream energy services, such as exploration and drilling for industrial oil and gas customers. Services are provided based on purchase orders or agreements with the customer and include prices based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred.

The Company's Safety-Kleen operating segment generally has the following two sources of revenue:

Safety-Kleen Environmental Services—Safety-Kleen Environmental Services revenues are generated from providing parts washer services, containerized waste handling and disposal services, oil collection services, vacuum services, direct sales of blended oil products and other complementary services and product sales. Containerized waste services consist of profiling, collecting, transporting and recycling or disposing of a wide variety of waste. Other products and services include sale of complementary supply products including automotive fluids and shop supplies and other environmental services. Parts washer services include customer use of our parts washer equipment, cleaning and maintenance of the parts washer equipment and removal and replacement of used cleaning fluids. Parts washer services are considered a single performance obligation due to the highly integrated and interdependent nature of the arrangement. Revenue from parts washer services is recognized over the service interval as the customer receives the benefit of the services. Collection and transportation revenues are recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. Product revenue is recognized upon the transfer of control whereby control transfers when the products are delivered to the customer.

Safety-Kleen Oil—Revenues from Safety-Kleen Oil are generated from sales of high-quality base and blended lubricating oils to third-party distributors, government agencies, fleets, railroads and industrial customers. The business also sells recycled fuel oil to asphalt plants, industrial plants and pulp and paper companies. The used oil is also processed into vacuum gas oil which can be

further re-refined into lubricant base oils or sold directly into the marine diesel oil fuel market. Revenue for oil products is recognized at a point in time, upon the transfer of control. Control transfers when the products are delivered to the customer.

Disaggregation of Revenue

We disaggregate the Company's third party revenues by geographic location and source of revenue as we believe these categories depict how revenue and cash flows are affected by economic factors (in thousands):


	For the Three Months Ended September 30, 2020
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	409,787	$	257,048	$	(186)	$	666,649
Canada	88,396		24,041		258		112,695
Total third-party revenues	$	498,183	$	281,089	$	72	$	779,344

Sources of Revenue (1)
Technical Services	$	257,612	$	—	$	—	$	257,612
Field and Emergency Response Services	115,989		—		—		115,989
Industrial Services and Other	124,582		—		72		124,654
Safety-Kleen Environmental Services	—		203,455		—		203,455
Safety-Kleen Oil	—		77,634		—		77,634
Total third-party revenues	$	498,183	$	281,089	$	72	$	779,344


	For the Three Months Ended September 30, 2019
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	450,638	$	313,979	$	(265)	$	764,352
Canada	99,484		27,438		394		127,316
Total third-party revenues	$	550,122	$	341,417	$	129	$	891,668

Sources of Revenue (1)
Technical Services	$	292,506	$	—	$	—	$	292,506
Field and Emergency Response Services	95,546		—		—		95,546
Industrial Services and Other (2)	162,070		—		129		162,199
Safety-Kleen Environmental Services	—		217,439		—		217,439
Safety-Kleen Oil	—		123,978		—		123,978
Total third-party revenues	$	550,122	$	341,417	$	129	$	891,668


	For the Nine Months Ended September 30, 2020
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	1,253,252	$	791,919	$	(648)	$	2,044,523
Canada	237,389		65,129		866		303,384
Total third-party revenues	$	1,490,641	$	857,048	$	218	$	2,347,907

Sources of Revenue (1)
Technical Services	$	774,814	$	—	$	—	$	774,814
Field and Emergency Response Services	349,254		—		—		349,254
Industrial Services and Other	366,573		—		218		366,791
Safety-Kleen Environmental Services	—		612,808		—		612,808
Safety-Kleen Oil	—		244,240		—		244,240
Total third-party revenues	$	1,490,641	$	857,048	$	218	$	2,347,907


	For the Nine Months Ended September 30, 2019
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	1,270,556	$	917,240	$	531	$	2,188,327
Canada	279,558		72,906		394		352,858
Total third-party revenues	$	1,550,114	$	990,146	$	925	$	2,541,185

Sources of Revenue (1)
Technical Services	$	820,333	$	—	$	—	$	820,333
Field and Emergency Response Services	253,894		—		—		253,894
Industrial Services and Other (2)	475,887		—		925		476,812

Safety-Kleen Environmental Services	—		640,956		—		640,956
Safety-Kleen Oil	—		349,190		—		349,190
Total third-party revenues	$	1,550,114	$	990,146	$	925	$	2,541,185

________________

(1) All revenue except oil and oil product sales within Safety-Kleen Oil and product sales within Safety-Kleen Environmental Services, which include various automotive related fluids, shop supplies and direct blended oil sales, are recognized over time. Safety-Kleen Oil and Safety-Kleen Environmental Services product sales are recognized at a point in time.

(2) Third-party revenues previously reported as Oil, Gas and Lodging Services of $30.2 million and Other of $0.1 million for the three months ended September 30, 2019, respectively, and $91.9 million and $0.9 million, respectively for the nine months ended September 30, 2019, are now disclosed within Industrial Services and Other based on relative materiality to the business.

Contract Balances


(in thousands)	September 30, 2020		December 31, 2019
Receivables	$	602,069	$	644,738
Contract assets (unbilled receivables)	59,438		56,326
Contract liabilities (deferred revenue)	67,412		73,370

The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets) and customer advances and deposits or deferred revenue (contract liabilities) on the consolidated balance sheet. Generally, billing occurs subsequent to revenue recognition, as a right to payment is not just subject to passage of time, resulting in contract assets. Contract assets are generally classified as current. The Company sometimes receives advances or deposits from its customers before revenue is recognized, resulting in contract liabilities. These assets and liabilities are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period. The contract liability balances at the beginning of each period presented were generally fully recognized in the subsequent three-month period.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

BUSINESS COMBINATIONS	9 Months Ended
BUSINESS COMBINATIONS	Sep. 30, 2020
Business Combinations [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS 2020 Acquisition On April 17, 2020, the Company acquired a privately-owned business for $8.8 million cash consideration. The acquired company expands the Safety-Kleen segment's oil re-refining operations to the northeast United States. In connection with this acquisition, a preliminary goodwill amount of $1.4 million was recognized. 2019 Acquisitions On May 31, 2019, the Company acquired a privately-owned business for $14.8 million cash consideration. The acquired company expands the environmental services and hazardous materials management services of the Company and is included in the Environmental Services segment. In connection with this acquisition, a goodwill amount of $7.4 million was recognized. On March 1, 2019, the Company acquired certain assets of a privately-owned business for $10.4 million cash consideration. The acquired business complements the Safety-Kleen segment's core service offerings, such as used motor oil collection, parts washers, oil filter recycling and vacuum services. In connection with this acquisition, a goodwill amount of $5.2 million was recognized.

INVENTORIES AND SUPPLIES

9 Months Ended

Sep. 30, 2020

Inventory Disclosure [Abstract]

INVENTORIES AND SUPPLIES

Inventories and supplies consisted of the following (in thousands):


	September 30, 2020		December 31, 2019
Oil and oil related products	$	77,808	$	75,408
Supplies and drums	119,157		115,128
Solvent and solutions	10,290		9,973

Other	13,629		14,235
Total inventories and supplies	$	220,884	$	214,744

Supplies and drums consist primarily of drums and containers used in providing the Company's products and services, critical spare parts to support the Company's incinerator and re-refinery operations and personal protective equipment. Other inventories consisted primarily of parts washer components, cleaning fluids, absorbents and automotive fluids, such as windshield washer fluid and antifreeze

PROPERTY, PLANT AND EQUIPMENT

9 Months Ended

Sep. 30, 2020

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (in thousands):


	September 30, 2020		December 31, 2019
Land	$	139,184	$	131,023
Asset retirement costs (non-landfill)	16,185		15,924
Landfill assets	185,678		182,276
Buildings and improvements (1)	502,507		499,159
Camp equipment	154,427		158,277
Vehicles (2)	819,583		785,056
Equipment (3)	1,798,792		1,779,366
Furniture and fixtures	6,920		6,054
Construction in progress	20,928		36,679
	3,644,204		3,593,814
Less - accumulated depreciation and amortization	2,104,871		2,005,663
Total property, plant and equipment, net	$	1,539,333	$	1,588,151

________________

(1) Balances inclusive of gross right-of-use ("ROU") assets classified as finance leases of $8.0 million and $31.0 million, respectively.

(2) Balances inclusive of gross ROU assets classified as finance leases of $43.8 million and $2.4 million, respectively.

(3) September 30, 2020 balance inclusive of gross ROU assets classified as finance leases of $9.1 million.

Depreciation expense, inclusive of landfill and finance lease amortization, was $64.9 million and $193.9 million for the three and nine months ended September 30, 2020, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $65.3 million and $196.7 million for the three and nine months ended September 30, 2019, respectively.

GOODWILL AND OTHER INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

The changes in goodwill by segment for the nine months ended September 30, 2020 were as follows (in thousands):


	Environmental Services		Safety-Kleen		Totals
Balance at January 1, 2020	$	212,531	$	312,482	$	525,013
Increase from current period acquisition	—		1,440		1,440
Measurement period adjustments from prior period acquisitions	23		—		23
Decrease from disposition of businesses	(674)		—		(674)

Foreign currency translation	(741)		(800)		(1,541)
Balance at September 30, 2020	$	211,139	$	313,122	$	524,261

The Company assesses goodwill for impairment on an annual basis as of December 31 or at an interim date when events or changes in the business environment ("triggering events") would more likely than not reduce the fair value of a reporting unit below its carrying value. During the period ended September 30, 2020, the Company considered the effects of COVID-19 and evolving changes in demand and pricing for oil, but concluded that there were no triggering events requiring an impairment assessment. This conclusion was based on a qualitative analysis incorporating (i) the significant excess fair value that previously existed in each reporting unit and (ii) assessing the current and long-term performance of the Company given the expectation that these negative effects on the operations and cash flows of each reporting unit arising from COVID-19 related disruptions will be short-lived.

The Company continues to evaluate the impact of macroeconomic conditions including, but not limited to, the impact of the COVID-19 pandemic on the Company, customers and the greater economy as well as the impact on trends of oil demand. If these macroeconomic conditions are protracted or result in significant changes in demand for our products and services, a goodwill impairment might be identified and the amount might be material.

As of September 30, 2020 and December 31, 2019, the Company's intangible assets consisted of the following (in thousands):


	September 30, 2020						December 31, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	182,478	$	92,725	$	89,753	$	184,235	$	87,228	$	97,007
Customer and supplier relationships	388,862		213,700		175,162		401,696		207,884		193,812
Other intangible assets	38,153		33,334		4,819		38,331		33,018		5,313
Total amortizable permits and other intangible assets	609,493		339,759		269,734		624,262		328,130		296,132
Trademarks and trade names	122,667		—		122,667		122,934		—		122,934
Total permits and other intangible assets	$	732,160	$	339,759	$	392,401	$	747,196	$	328,130	$	419,066

Amortization expense of permits and other intangible assets was $9.6 million and $27.6 million in the three and nine months ended September 30, 2020, respectively. Amortization expense of permits and other intangible assets was $8.4 million and $26.6 million in the three and nine months ended September 30, 2019, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at September 30, 2020 was as follows (in thousands):


Years Ending December 31,	Expected Amortization
2020 (three months)	$	7,841
2021	29,997
2022	29,742
2023	25,482
2024	23,997
Thereafter	152,675
	$	269,734

ACCRUED EXPENSES

9 Months Ended

Sep. 30, 2020

Payables and Accruals [Abstract]

ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):


	September 30, 2020		December 31, 2019
Accrued insurance	$	77,985	$	74,376
Accrued interest	9,179		21,222
Accrued compensation and benefits	60,784		72,473
Accrued income, real estate, sales and other taxes	54,677		35,749
Interest rate swap liability	36,649		20,840
Accrued other	53,926		51,880
	$	293,200	$	276,540

CLOSURE AND POST-CLOSURE LIABILITIES

9 Months Ended

Sep. 30, 2020

Asset Retirement Obligation Disclosure [Abstract]

CLOSURE AND POST-CLOSURE LIABILITIES

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2020 through September 30, 2020 were as follows (in thousands):


	Landfill Retirement Liability		Non-Landfill Retirement Liability		Total
Balance at January 1, 2020	$	39,401	$	36,250	$	75,651
Liabilities assumed in acquisitions	—		265		265

New asset retirement obligations	1,643		—		1,643

Accretion	2,373		2,516		4,889
Changes in estimates recorded to statement of operations	4,503		(14)		4,489
Changes in estimates recorded to balance sheet	179		15		194
Expenditures	(2,116)		(622)		(2,738)
Currency translation and other	(133)		(44)		(177)
Balance at September 30, 2020	$	45,850	$	38,366	$	84,216

During the first nine months of 2020, the Company has taken actions to begin the closure of one of its commercial landfill sites resulting in a $4.5 million increase to the related closure and post-closure liability. The remaining ten landfill facilities remain active as of September 30, 2020. In the nine months ended September 30, 2020, other than this charge, there were no significant charges (benefits) resulting from changes in estimates for closure and post-closure liabilities.

New asset retirement obligations incurred during the first nine months of 2020 were discounted at the credit-adjusted risk-free rate of 5.60%.

REMEDIAL LIABILITIES

9 Months Ended

Sep. 30, 2020

Environmental Remediation Obligations [Abstract]

REMEDIAL LIABILITIES

The changes to remedial liabilities from January 1, 2020 through September 30, 2020 were as follows (in thousands):


	Remedial Liabilities for Landfill Sites		Remedial Liabilities for Inactive Sites		Remedial Liabilities (Including Superfund) for Non-Landfill Operations		Total
Balance at January 1, 2020	$	1,851	$	61,991	$	50,331	$	114,173


Accretion	67		1,914		1,279		3,260
Changes in estimates recorded to statement of operations	(14)		3,023		1,552		4,561
Expenditures	(46)		(3,278)		(2,754)		(6,078)
Currency translation and other	—		(912)		563		(349)
Balance at September 30, 2020	$	1,858	$	62,738	$	50,971	$	115,567

In the nine months ended September 30, 2020, the Company increased its remedial liabilities for an inactive site by $3.3 million and increased its remedial liabilities for a Superfund site by $1.8 million due to changes in the estimates of the related liabilities. These changes in estimates were triggered by the receipts of updated regulatory approval requirements for remediation. Other than these charges, there were no significant charges (benefits) resulting from changes in estimates for remedial liabilities.

FINANCING ARRANGEMENTS

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

FINANCING ARRANGEMENTS

The following table is a summary of the Company’s financing arrangements (in thousands):


Current Obligations:	September 30, 2020		December 31, 2019
Secured senior term loans ("Term Loans")	$	7,535	$	7,535

Long-Term Obligations:
Secured senior Term Loans due June 30, 2024	$	721,510	$	727,162
Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes")	545,000		545,000
Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes")	300,000		300,000
Long-term obligations, at par	$	1,566,510	$	1,572,162
Unamortized debt issuance costs and premium, net	(15,754)		(18,046)
Long-term obligations, at carrying value	$	1,550,756	$	1,554,116

Financing Activities

As of September 30, 2020 and December 31, 2019, the estimated fair value of the Company’s outstanding long-term obligations, including the current portion, was $1.6 billion. The Company’s estimates of fair value of its long-term obligations, including the current portion, are based on quoted market prices or other available market data which are considered Level 2 measures according to the fair value hierarchy. Level 2 utilizes quoted market prices in markets that are not active, broker or dealer quotations or alternative pricing sources with reasonable levels of price transparency for similar assets and liabilities.

The Company maintains a $400.0 million revolving credit facility. On March 31, 2020, the Company drew down $150.0 million on the revolving credit facility in response to the uncertainty surrounding the COVID-19 global pandemic. The Company repaid $75.0 million of that borrowing on June 29, 2020, and the remaining $75.0 million on July 28, 2020. As of September 30, 2020, the Company had $249.1 million available to borrow under the revolving credit facility and outstanding letters of credit were $123.5 million. At December 31, 2019, $229.2 million was available to borrow and outstanding letters of credit were $146.9 million.

On October 28, 2020, the Company entered into an amended and restated credit agreement for its revolving credit facility. Under the amended and restated agreement, the terms are substantially the same as under the prior agreement, but the facility termination date has been extended to October 28, 2025, subject to certain conditions.

Cash Flow Hedges

The Company’s strategy to hedge against fluctuations in variable interest rates involves entering into interest rate derivative agreements. Although the interest rate on the Term Loans is variable, the Company has effectively fixed the interest rate on $350.0 million aggregate principal amount of the Term Loans outstanding by entering into interest rate swap agreements in 2018 with a notional amount of $350.0 million. Under the terms of the interest rate swap agreements, the Company receives interest based on the one-month LIBOR index and pays interest at a weighted average annual interest rate of 2.92%, resulting in an effective annual interest rate of 4.67%.

The Company recognizes derivative instruments as either assets or liabilities on the balance sheet at fair value. No ineffectiveness has been identified on these swaps and, therefore, all unrealized changes in fair value are recorded in accumulated other comprehensive loss. Amounts are reclassified from accumulated other comprehensive loss into interest expense on the statement of operations in the same period or periods during which the hedged transaction affects earnings.

As of September 30, 2020 and December 31, 2019, the Company has recorded an interest rate swap liability with a fair value of $36.6 million and $20.8 million, respectively, within accrued expenses in connection with these cash flow hedges.

The fair value of the interest rate swaps is calculated using discounted cash flow valuation methodologies based upon the one-month LIBOR yield curves that are observable at commonly quoted intervals for the full term of the interest rate swaps and as such is considered a Level 2 measure according to the fair value hierarchy.

INCOME TAXES	9 Months Ended
INCOME TAXES	Sep. 30, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company records a tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income or loss to determine the income tax provision or benefit allocated to the interim period. Losses from jurisdictions for which no benefit can be recognized and the income tax effects of unusual or infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period. The estimated annual effective tax rate may be significantly impacted by projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised. The Company’s effective tax rate for the three and nine months ended September 30, 2020 was 20.0% and 27.0%, compared to 32.8% and 35.1%, respectively, for the comparable periods in 2019. As of September 30, 2020 and December 31, 2019, the Company had recorded $5.2 million and $6.4 million, respectively, of liabilities for unrecognized tax benefits and $1.9 million and $1.7 million, respectively, of interest. The Company released $1.1 million of uncertain tax positions in the three months ended September 30, 2020. The Internal Revenue Service ("IRS") completed its examination of the Company’s tax years 2014-2016 and the Joint Committee on Taxation completed its review and took no exception. No material adjustments were made to the previously filed returns as a result of this process. In the third quarter of 2020, the Company received a refund of $7.7 million associated with the amended returns for these tax years.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

EARNINGS PER SHARE

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

EARNINGS PER SHARE

The following are computations of basic and diluted earnings per share (in thousands, except per share amounts):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Numerator for basic and diluted earnings per share:
Net income	$	54,910	$	36,369	$	95,505	$	73,589

Denominator:
Basic shares outstanding	55,592		55,850		55,646		55,858
Dilutive effect of outstanding stock awards	146		315		186		251
Dilutive shares outstanding	55,738		56,165		55,832		56,109

Basic earnings per share:	$	0.99	$	0.65	$	1.72	$	1.32

Diluted earnings per share:	$	0.99	$	0.65	$	1.71	$	1.31

For the three months ended September 30, 2020 and September 30, 2019, all then outstanding performance awards and restricted stock awards were included in the calculation of diluted earnings per share except for 235,806 and 147,075, respectively, of performance stock awards for which the performance criteria were not attained at the time and 16,183 and 3,567, respectively, of restricted stock awards which were excluded as their inclusion would have an antidilutive effect.

For the nine months ended September 30, 2020 and September 30, 2019, all then outstanding performance awards and restricted stock awards were included in the calculation of diluted earnings per share except for 235,806 and 147,075, respectively, of performance stock awards for which the performance criteria were not attained at the time and 14,516 and 14,223, respectively, of restricted stock awards which were excluded as their inclusion would have an antidilutive effect.

ACCUMULATED OTHER COMPREHENSIVE LOSS

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE LOSS

The changes in accumulated other comprehensive loss by component and related tax impacts for the nine months ended September 30, 2020 were as follows (in thousands):


	Foreign Currency Translation		Unrealized Gains (Losses) on Available-For-Sale Securities		Unrealized Loss on Interest Rate Hedge		Unfunded Pension Liability		Total
Balance at January 1, 2020	$	(187,795)	$	143	$	(20,839)	$	(1,560)	$	(210,051)
Other comprehensive (loss) income before reclassifications and tax impacts	(15,044)		141		(21,505)		—		(36,408)
Amounts reclassified out of accumulated other comprehensive loss	—		—		5,696		—		5,696
Tax gain (loss)	1,349		(30)		—		—		1,319
Other comprehensive (loss) income, net of tax	(13,695)		111		(15,809)		—		(29,393)
Balance at September 30, 2020	$	(201,490)	$	254	$	(36,648)	$	(1,560)	$	(239,444)

The amount reclassified out of accumulated other comprehensive loss into the consolidated statement of operations, with presentation location, during the three and nine months ended September 30, 2020 was as follows (in thousands):


Other Comprehensive Income (Loss) Components	For the Three Months Ended September 30, 2020		For the Nine Months Ended September 30, 2020		Location

Unrealized loss on interest rate hedge	$	(2,468)	$	(5,696)	Interest expense, net of interest income

STOCK-BASED COMPENSATION

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

On June 3, 2020, our shareholders approved the Clean Harbor's Inc. 2020 Stock Incentive Plan (the "2020 Plan"), which became effective on that date. The 2020 Plan provides for future awards of up to 2.5 million shares of the Company’s common stock (subject to certain anti-dilution adjustments) in the form of stock options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards. The 2020 Plan is administered by the Compensation Committee of the Company’s Board of Directors. The Company's previous stock incentive plan (the "2010 Plan") expired on May 10, 2020. In connection with the adoption of the 2020 Plan, no further awards will be made under the 2010 Plan.

Total stock-based compensation cost charged to selling, general and administrative expenses for the three and nine months ended September 30, 2020 was $6.7 million and $12.7 million, respectively. Total stock-based compensation cost charged to selling, general and administrative expenses for the three and nine months ended September 30, 2019 was $5.0 million and $14.7 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation expense for the three and nine months ended September 30, 2020 was $1.7 million and $2.9 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation expense for the three and nine months ended September 30, 2019 was $1.0 million and $2.8 million, respectively.

Restricted Stock Awards

The following table summarizes information about restricted stock awards for the nine months ended September 30, 2020:


Restricted Stock	Number of Shares	Weighted Average Grant-Date Fair Value
Balance at January 1, 2020	522,597	$	59.57
Granted	205,548	58.54
Vested	(199,476)	57.59
Forfeited	(38,515)	58.81
Balance at September 30, 2020	490,154	60.01

As of September 30, 2020, there was $22.0 million of total unrecognized compensation cost arising from restricted stock awards. This cost is expected to be recognized over a weighted average period of 2.8 years. The total fair value of restricted stock vested during the three and nine months ended September 30, 2020 was $3.1 million and $12.8 million, respectively. The total fair

value of restricted stock vested during the three and nine months ended September 30, 2019 was $4.2 million and $15.3 million, respectively.

Performance Stock Awards

Performance stock awards are subject to performance criteria established by the Compensation Committee of the Company's Board of Directors prior to or at the date of grant. The vesting of the performance stock awards is based on achieving targets typically based on revenue, Adjusted EBITDA margin, Adjusted Free Cash Flow and Total Recordable Incident Rate. In addition, performance stock awards include continued service conditions.

The following table summarizes information about performance stock awards for the nine months ended September 30, 2020:


Performance Stock	Number of Shares	Weighted Average Grant-Date Fair Value
Balance at January 1, 2020	204,553	$	64.78
Granted	161,610	58.30
Vested	(23,222)	55.75
Forfeited	(16,330)	64.59
Balance at September 30, 2020	326,611	62.22

As of September 30, 2020, there was $5.7 million of total unrecognized compensation cost arising from unvested performance stock awards deemed probable of vesting. No performance awards vested during the three months ended September 30, 2020 and September 30, 2019. The total fair value of performance awards vested during the nine months ended September 30, 2020 and September 30, 2019 was $1.3 million and $2.9 million, respectively.

COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES The Company and its subsidiaries are subject to legal proceedings and claims arising in the ordinary course of business. Actions filed against the Company arise from commercial and employment-related claims including alleged class actions related to sales practices and wage and hour claims. The plaintiffs in these actions may be seeking damages or injunctive relief or both. These actions are in various jurisdictions and stages of proceedings, and some are covered in part by insurance. In addition, the Company’s waste management services operations are regulated by federal, state, provincial and local laws enacted to regulate discharge of materials into the environment, remediation of contaminated soil and groundwater or otherwise protect the environment. This ongoing regulation results in the Company frequently becoming a party to legal or administrative proceedings involving all levels of governmental authorities and other interested parties. The issues involved in such proceedings generally relate to alleged violations of existing permits and licenses or alleged responsibility under federal or state Superfund laws to remediate contamination at properties owned either by the Company or by other parties (“third-party sites”) to which either the Company or the prior owners of certain of the Company’s facilities shipped waste. At September 30, 2020 and December 31, 2019, the Company had recorded reserves of $29.9 million and $26.0 million, respectively, in the Company's financial statements for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. In management's opinion, it is not reasonably possible that the potential liability beyond what has been recorded, if any, that may result from these actions, either individually or collectively, will have a material effect on our financial position, results of operations or cash flows. The Company periodically adjusts the aggregate amount of these reserves when actual or probable liabilities are paid or otherwise discharged, new claims arise or additional relevant information about existing or probable claims becomes available. As of September 30, 2020 and December 31, 2019, the $29.9 million and $26.0 million, respectively, of reserves consisted of (i) $24.1 million and $18.4 million, respectively, related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets, and (ii) $5.8 million and $7.6 million, respectively, primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses on the consolidated balance sheets. Legal and Administrative Proceedings As of September 30, 2020, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2020, were as follows: Ville Mercier. In September 2002, the Company acquired the stock of a subsidiary (the "Mercier Subsidiary") which owns a hazardous waste incinerator in Ville Mercier, Quebec (the "Mercier Facility"). The property adjacent to the Mercier Facility, which is also owned by the Mercier Subsidiary, is now contaminated as a result of actions dating back to 1968, when the Government of Quebec issued two permits to dump organic liquids into lagoons on the property to a company unrelated to the Mercier Subsidiary. In 1999, Ville Mercier and three neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec. In 2012, the municipalities amended their existing statement of claim to seek $2.9 million (CAD) in general damages and $10.0 million (CAD) in punitive damages, plus interest and costs, as well as injunctive relief. Both the Government of Quebec and the Company have filed summary judgment motions against the municipalities. The parties are attempting to negotiate a resolution and hearings on the motions have been delayed. In September 2007, the Quebec Minister of Sustainable Development, Environment and Parks issued a notice pursuant to Section 115.1 of the Environment Quality Act, superseding notices issued in 1992, which are the subject of the pending litigation. The more recent notice notifies the Mercier Subsidiary that, if the Mercier Subsidiary does not take certain remedial measures at the site, the Minister intends to undertake those measures at the site and claim direct and indirect costs related to such measures. The Company has accrued for costs expected to be incurred relative to the resolution of this matter and believes this matter will not have future material effect on its financial position, results of operations or cash flows. Safety-Kleen Legal Proceedings. On December 28, 2012, the Company acquired Safety-Kleen, Inc. ("Safety-Kleen") and thereby became subject to the legal proceedings in which Safety-Kleen was a party on that date. In addition to certain Superfund proceedings in which Safety-Kleen has been named as a potentially responsible party as described below under “Superfund Proceedings,” the principal such legal proceedings involving Safety-Kleen which were outstanding as of September 30, 2020 were as follows: Product Liability Cases. Safety-Kleen has been named as a defendant in various lawsuits that are currently pending in various courts and jurisdictions throughout the United States, including approximately 69 proceedings (excluding cases which have been settled but not formally dismissed) as of September 30, 2020, wherein persons claim personal injury resulting from the use of Safety-Kleen's parts washer equipment or cleaning products. These proceedings typically involve allegations that the solvent used in Safety-Kleen's parts washer equipment contains contaminants and/or that Safety-Kleen's recycling process does not effectively remove the contaminants that become entrained in the solvent during their use. In addition, certain claimants assert that Safety-Kleen failed to adequately warn the product user of potential risks, including a historic failure to warn that solvent contains trace amounts of toxic or hazardous substances such as benzene. The Company maintains insurance that it believes will provide coverage for these product liability claims (over amounts accrued for self-insured retentions and deductibles in certain limited cases), except for punitive damages to the extent not insurable under state law or excluded from insurance coverage. The Company also believes that these claims lack merit and has historically vigorously defended, and intends to continue to vigorously defend, itself and the safety of its products against all these claims. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. Consequently, the Company is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of September 30, 2020. From January 1, 2020 to September 30, 2020, ten product liability claims were settled or dismissed. Due to the nature of these claims and the related insurance, the Company did not incur any expense as insurance provided coverage in full for all such claims. Safety-Kleen may be named in similar, additional lawsuits in the future, including claims for which insurance coverage may not be available. Superfund Proceedings The Company has been notified that either the Company (which, since December 28, 2012, includes Safety-Kleen) or the prior owners of certain of the Company's facilities for which the Company may have certain indemnification obligations have been identified as potentially responsible parties ("PRPs") or potential PRPs in connection with 130 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 130 sites, five (including the BR Facility described below) involve facilities that are now owned or leased by the Company and 125 involve third-party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. Of the 125 third-party sites, 31 are now settled, 15 are currently requiring expenditures on remediation and 79 are not currently requiring expenditures on remediation. In connection with each site, the Company has estimated the extent, if any, to which it may be subject, either directly or as a result of any indemnification obligations, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability, if any, of the Company or the prior owners of certain of the Company's facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts and the existence and legal standing of indemnification agreements, if any, with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations. The Company believes its potential liability could exceed $100,000 at nine of the 125 third-party sites. BR Facility. The Company acquired in 2002 a former hazardous waste incinerator and landfill in Baton Rouge (the "BR Facility"), for which operations had been previously discontinued by the prior owner. In September 2007, the U.S. Environmental Protection Agency ("EPA") issued a special notice letter to the Company related to the Devil's Swamp Lake Site ("Devil's Swamp") in East Baton Rouge Parish, Louisiana. Devil's Swamp includes a lake located downstream of an outfall ditch where wastewater and storm water have been discharged, and Devil's Swamp is proposed to be included on the National Priorities List due to the presence of Contaminants of Concern ("COC") cited by the EPA. These COCs include substances of the kind found in wastewater and storm water discharged from the BR Facility in past operations. The EPA originally requested COC generators to submit a good faith offer to conduct a remedial investigation feasibility study directed towards the eventual remediation of the site. In 2018, the Company completed performing corrective actions at the BR Facility under an order issued by the Louisiana Department of Environmental Quality and has also completed conducting the remedial investigation feasibility study for Devil's Swamp under the order issued by the EPA at which point the feasibility study, with several remedial alternatives, was submitted to the EPA for review. During the quarter ended September 30, 2020, the EPA signed a Record of Decision which defines the remediation alternative selected and approved by the EPA. Based upon this Record of Decision, the Company increased the estimated remedial liability for this inactive site by $3.3 million. As of September 30, 2020, the Company has recorded the best estimate of the costs to execute upon this remediation alternative. Changes in the natural landscape and/or new information identified during the remediation could impact this estimate, however are not expected to have a future material effect on the Company's financial position, liquidity or results of operation. Third-Party Sites. Of the 125 third-party sites at which the Company has been notified it is a PRP or potential PRP or may have indemnification obligations, Clean Harbors has an indemnification agreement at 11 of these sites with ChemWaste, a former subsidiary of Waste Management, Inc., and at six additional of these third-party sites, Safety-Kleen has a similar indemnification agreement with McKesson Corporation. These agreements indemnify the Company (which now includes Safety-Kleen) with respect to any liability at the 17 sites for waste disposed prior to the Company's (or Safety-Kleen's) acquisition of the former subsidiaries of Waste Management and McKesson which had shipped wastes to those sites. Accordingly, Waste Management or McKesson are paying all costs of defending those subsidiaries in those 17 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company's ultimate liabilities for those sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. Except for the indemnification agreements which the Company holds from ChemWaste, McKesson and two other entities, the Company does not have an indemnity agreement with respect to any of the 125 third-party sites discussed above. Federal, State and Provincial Enforcement Actions From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of September 30, 2020 and December 31, 2019, there were 11 and 12 proceedings, respectively, for which the Company reasonably believes that the sanctions could equal or exceed $100,000. The Company believes that the fines or other penalties in these or any of the other regulatory proceedings will, individually or in the aggregate, not have a material effect on its financial condition, results of operations or cash flows. Self-Insurance Liabilities Under the Company's insurance programs, coverage is obtained for catastrophic exposures, as well as those risks required to be insured by law or contract. The Company's policy is to retain a significant portion of certain expected losses related to employee medical, workers' compensation, comprehensive general liability and vehicle liability. A portion of these self-insured liabilities are managed through its wholly-owned captive insurance subsidiary. Provisions for losses expected under these programs are recorded based upon the Company's estimates of the aggregate liability for claims. We maintain umbrella insurance to limit our exposure to certain catastrophic claim costs, including general liability and vehicle claim costs. For the policy year starting in the fourth quarter of 2020, the Company changed the umbrella policy terms to include a $5.0 million annual aggregate self-insured corridor retention.

SEGMENT REPORTING

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

SEGMENT REPORTING

Segment reporting is prepared on the same basis that the Company's chief executive officer, who is the Company's chief operating decision maker, manages the business, makes operating decisions and assesses performance. The Company is managed and reports as two operating segments; (i) the Environmental Services segment and (ii) the Safety-Kleen segment.

Third-party revenue is revenue billed to outside customers by a particular segment. Direct revenues is revenue allocated to the segment providing the product or service. Intersegment revenues represent the sharing of third-party revenues among the segments based on products and services provided by each segment as if the products and services were sold directly to the third-party. The intersegment revenues are shown net. The operations not managed through the Company’s operating segments described above are recorded as “Corporate Items.”

The following table reconciles third-party revenues to direct revenues for the three and nine months ended September 30, 2020 and September 30, 2019 (in thousands):


	For the Three Months Ended September 30, 2020								For the Three Months Ended September 30, 2019
	Third-party revenues		Intersegment revenues, net		Corporate Items, net		Direct revenues		Third-party revenues		Intersegment revenues, net		Corporate Items, net		Direct revenues
Environmental Services	$	498,183	$	29,448	$	339	$	527,970	$	550,122	$	35,274	$	1,476	$	586,872
Safety-Kleen	281,089		(29,448)		(1)		251,640		341,417		(35,274)		2		306,145
Corporate Items	72		—		(338)		(266)		129		—		(1,478)		(1,349)
Total	$	779,344	$	—	$	—	$	779,344	$	891,668	$	—	$	—	$	891,668


	For the Nine Months Ended September 30, 2020								For the Nine Months Ended September 30, 2019
	Third-party revenues		Intersegment revenues, net		Corporate Items, net		Direct revenues		Third-party revenues		Intersegment revenues, net		Corporate Items, net		Direct revenues
Environmental Services	$	1,490,641	$	97,782	$	2,823	$	1,591,246	$	1,550,114	$	105,555	$	3,301	$	1,658,970
Safety-Kleen	857,048		(97,782)		142		759,408		990,146		(105,555)		15		884,606
Corporate Items	218		—		(2,965)		(2,747)		925		—		(3,316)		(2,391)
Total	$	2,347,907	$	—	$	—	$	2,347,907	$	2,541,185	$	—	$	—	$	2,541,185

The primary financial measure by which the Company evaluates the performance of its segments is "Adjusted EBITDA," which consists of net income plus accretion of environmental liabilities, depreciation and amortization, net interest expense, loss on early extinguishment of debt, provision for income taxes and other gains, losses or non-cash charges not deemed representative of fundamental segment results and other expense (income), net. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers.

The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):


	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Adjusted EBITDA:
Environmental Services	$	140,854	$	121,658	$	387,851	$	329,036
Safety-Kleen	68,761		81,326		176,498		215,578
Corporate Items	(48,444)		(46,371)		(145,108)		(136,513)
Total	161,171		156,613		419,241		408,101
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,822		2,490		8,149		7,624
Depreciation and amortization	74,470		73,756		221,497		223,328

Income from operations	83,879		80,367		189,595		177,149
Other (income) expense, net	(2,268)		427		597		(1,992)
Loss on early extinguishment of debt	—		6,119		—		6,119
Loss on sale of businesses	118		—		3,376		—
Interest expense, net of interest income	17,407		19,702		54,848		59,681
Income before provision for income taxes	$	68,622	$	54,119	$	130,774	$	113,341

The following table presents certain assets by reportable segment and in the aggregate (in thousands):


	September 30, 2020		December 31, 2019
Property, plant and equipment, net:
Environmental Services	$	890,262	$	939,352
Safety-Kleen	559,178		555,310
Corporate Items	89,893		93,489
Total property, plant and equipment, net	$	1,539,333	$	1,588,151

Goodwill and Permits and other intangibles, net:
Environmental Services
Goodwill	$	211,139	$	212,531
Permits and other intangibles, net	80,535		89,722
Total Environmental Services	291,674		302,253

Safety-Kleen
Goodwill	$	313,122	$	312,482
Permits and other intangibles, net	311,866		329,344
Total Safety-Kleen	624,988		641,826

Total	$	916,662	$	944,079

The following table presents the total assets by geographical area (in thousands):


	September 30, 2020		December 31, 2019
United States	$	3,452,839	$	3,413,254
Canada and other foreign	653,348		695,650
Total	$	4,106,187	$	4,108,904

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2020
Accounting Policies [Abstract]
Revenues	The Company generates revenues through its Environmental Services and Safety-Kleen operating segments. The Company's Environmental Services operating segment generally has the following three sources of revenue: Technical Services—Technical Services revenues are generated from fees charged for waste material management and disposal services including onsite environmental management services, collection and transportation, packaging, recycling, treatment and disposal of waste. Revenue is primarily generated by short-term projects, most of which are governed by master service agreements that are long-term in nature. These master service agreements are typically entered into with the Company's larger customers and outline the pricing and legal frameworks for such arrangements. Services are provided based on purchase orders or agreements with the customer and include prices based upon units of volume of waste and transportation and other fees. Collection and transportation revenues are recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. Revenues for treatment and disposal of waste are recognized upon completion of treatment, final disposition in a landfill or incineration, or when the waste is shipped to a third party for processing and disposal. The Company periodically enters into bundled arrangements for the collection and transportation and disposal of waste. For such arrangements, transportation and disposal are considered distinct performance obligations and the Company allocates revenue to each based on the relative standalone selling price (i.e., the estimated price that a customer would pay for the services on a standalone basis). Revenues from waste that is not yet completely processed and disposed and the related costs are deferred. The deferred revenues and costs are recognized when the related services are completed. The period between collection and transportation and the final processing and disposal ranges depending on the location of the customer, but generally is measured in days. Field and Emergency Response Services—Field Services revenues are generated from cleanup services at customer sites, including municipalities and utilities, or other locations on a scheduled or emergency response basis. Services include confined space entry for tank cleaning, site decontamination, large remediation projects, demolition, spill cleanup on land and water, railcar cleaning, product recovery and transfer and vacuum services. Additional services include filtration and water treatment services. Response services for environmental, contamination or pandemic related emergencies include any scale from man-made disasters such as oil spills, to natural disasters such as hurricanes. More recently demand has increased for projects involving contagion disinfection, decontamination and disposal services in response to the COVID-19 pandemic. Field and emergency response services are provided based on purchase orders or agreements with customers and include prices generally based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the service as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. The duration of such services can be over a number of hours, several days or even months for larger scale projects. Industrial Services and Other—Industrial Services revenues are primarily generated from industrial and specialty services provided to refineries, mines, upgraders, chemical plants, pulp and paper mills, manufacturing facilities, power generation facilities and other industrial customers throughout North America. Services include in-plant cleaning and maintenance services, plant outage and turnaround services, decoking and pigging, chemical cleaning, high and ultra-high pressure water cleaning, pipeline inspection and coating services, large tank and surface impoundment cleaning, oilfield transport, daylighting, production services and upstream energy services, such as exploration and drilling for industrial oil and gas customers. Services are provided based on purchase orders or agreements with the customer and include prices based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. The Company's Safety-Kleen operating segment generally has the following two sources of revenue: Safety-Kleen Environmental Services—Safety-Kleen Environmental Services revenues are generated from providing parts washer services, containerized waste handling and disposal services, oil collection services, vacuum services, direct sales of blended oil products and other complementary services and product sales. Containerized waste services consist of profiling, collecting, transporting and recycling or disposing of a wide variety of waste. Other products and services include sale of complementary supply products including automotive fluids and shop supplies and other environmental services. Parts washer services include customer use of our parts washer equipment, cleaning and maintenance of the parts washer equipment and removal and replacement of used cleaning fluids. Parts washer services are considered a single performance obligation due to the highly integrated and interdependent nature of the arrangement. Revenue from parts washer services is recognized over the service interval as the customer receives the benefit of the services. Collection and transportation revenues are recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. Product revenue is recognized upon the transfer of control whereby control transfers when the products are delivered to the customer. Safety-Kleen Oil—Revenues from Safety-Kleen Oil are generated from sales of high-quality base and blended lubricating oils to third-party distributors, government agencies, fleets, railroads and industrial customers. The business also sells recycled fuel oil to asphalt plants, industrial plants and pulp and paper companies. The used oil is also processed into vacuum gas oil which can be further re-refined into lubricant base oils or sold directly into the marine diesel oil fuel market. Revenue for oil products is recognized at a point in time, upon the transfer of control. Control transfers when the products are delivered to the customer.

- Definition

Disclosure of accounting policy for revenue from contract with customer.

+ References

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+ Details

REVENUES (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue


	For the Three Months Ended September 30, 2020
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	409,787	$	257,048	$	(186)	$	666,649
Canada	88,396		24,041		258		112,695
Total third-party revenues	$	498,183	$	281,089	$	72	$	779,344

Sources of Revenue (1)
Technical Services	$	257,612	$	—	$	—	$	257,612
Field and Emergency Response Services	115,989		—		—		115,989
Industrial Services and Other	124,582		—		72		124,654
Safety-Kleen Environmental Services	—		203,455		—		203,455
Safety-Kleen Oil	—		77,634		—		77,634
Total third-party revenues	$	498,183	$	281,089	$	72	$	779,344


	For the Three Months Ended September 30, 2019
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	450,638	$	313,979	$	(265)	$	764,352
Canada	99,484		27,438		394		127,316
Total third-party revenues	$	550,122	$	341,417	$	129	$	891,668

Sources of Revenue (1)
Technical Services	$	292,506	$	—	$	—	$	292,506
Field and Emergency Response Services	95,546		—		—		95,546
Industrial Services and Other (2)	162,070		—		129		162,199
Safety-Kleen Environmental Services	—		217,439		—		217,439
Safety-Kleen Oil	—		123,978		—		123,978
Total third-party revenues	$	550,122	$	341,417	$	129	$	891,668


	For the Nine Months Ended September 30, 2020
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	1,253,252	$	791,919	$	(648)	$	2,044,523
Canada	237,389		65,129		866		303,384
Total third-party revenues	$	1,490,641	$	857,048	$	218	$	2,347,907

Sources of Revenue (1)
Technical Services	$	774,814	$	—	$	—	$	774,814
Field and Emergency Response Services	349,254		—		—		349,254
Industrial Services and Other	366,573		—		218		366,791
Safety-Kleen Environmental Services	—		612,808		—		612,808
Safety-Kleen Oil	—		244,240		—		244,240
Total third-party revenues	$	1,490,641	$	857,048	$	218	$	2,347,907


	For the Nine Months Ended September 30, 2019
	Environmental Services		Safety-Kleen		Corporate		Total
Primary Geographical Markets
United States	$	1,270,556	$	917,240	$	531	$	2,188,327
Canada	279,558		72,906		394		352,858
Total third-party revenues	$	1,550,114	$	990,146	$	925	$	2,541,185

Sources of Revenue (1)
Technical Services	$	820,333	$	—	$	—	$	820,333
Field and Emergency Response Services	253,894		—		—		253,894
Industrial Services and Other (2)	475,887		—		925		476,812

Safety-Kleen Environmental Services	—		640,956		—		640,956
Safety-Kleen Oil	—		349,190		—		349,190
Total third-party revenues	$	1,550,114	$	990,146	$	925	$	2,541,185

________________

Schedule of Contract Balances


(in thousands)	September 30, 2020		December 31, 2019
Receivables	$	602,069	$	644,738
Contract assets (unbilled receivables)	59,438		56,326
Contract liabilities (deferred revenue)	67,412		73,370

INVENTORIES AND SUPPLIES (Tables)

9 Months Ended

Sep. 30, 2020

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories and supplies consisted of the following (in thousands):


	September 30, 2020		December 31, 2019
Oil and oil related products	$	77,808	$	75,408
Supplies and drums	119,157		115,128
Solvent and solutions	10,290		9,973

Other	13,629		14,235
Total inventories and supplies	$	220,884	$	214,744

PROPERTY, PLANT AND EQUIPMENT (Tables)

9 Months Ended

Sep. 30, 2020

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):


	September 30, 2020		December 31, 2019
Land	$	139,184	$	131,023
Asset retirement costs (non-landfill)	16,185		15,924
Landfill assets	185,678		182,276
Buildings and improvements (1)	502,507		499,159
Camp equipment	154,427		158,277
Vehicles (2)	819,583		785,056
Equipment (3)	1,798,792		1,779,366
Furniture and fixtures	6,920		6,054
Construction in progress	20,928		36,679
	3,644,204		3,593,814
Less - accumulated depreciation and amortization	2,104,871		2,005,663
Total property, plant and equipment, net	$	1,539,333	$	1,588,151

________________

(1) Balances inclusive of gross right-of-use ("ROU") assets classified as finance leases of $8.0 million and $31.0 million, respectively.

(2) Balances inclusive of gross ROU assets classified as finance leases of $43.8 million and $2.4 million, respectively.

(3) September 30, 2020 balance inclusive of gross ROU assets classified as finance leases of $9.1 million.

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes to Goodwill

The changes in goodwill by segment for the nine months ended September 30, 2020 were as follows (in thousands):


	Environmental Services		Safety-Kleen		Totals
Balance at January 1, 2020	$	212,531	$	312,482	$	525,013
Increase from current period acquisition	—		1,440		1,440
Measurement period adjustments from prior period acquisitions	23		—		23
Decrease from disposition of businesses	(674)		—		(674)

Foreign currency translation	(741)		(800)		(1,541)
Balance at September 30, 2020	$	211,139	$	313,122	$	524,261

Summary of Indefinite-Lived Intangible Assets

As of September 30, 2020 and December 31, 2019, the Company's intangible assets consisted of the following (in thousands):


	September 30, 2020						December 31, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	182,478	$	92,725	$	89,753	$	184,235	$	87,228	$	97,007
Customer and supplier relationships	388,862		213,700		175,162		401,696		207,884		193,812
Other intangible assets	38,153		33,334		4,819		38,331		33,018		5,313
Total amortizable permits and other intangible assets	609,493		339,759		269,734		624,262		328,130		296,132
Trademarks and trade names	122,667		—		122,667		122,934		—		122,934
Total permits and other intangible assets	$	732,160	$	339,759	$	392,401	$	747,196	$	328,130	$	419,066

Schedule of Finite-Lived Intangible Assets

As of September 30, 2020 and December 31, 2019, the Company's intangible assets consisted of the following (in thousands):


	September 30, 2020						December 31, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	182,478	$	92,725	$	89,753	$	184,235	$	87,228	$	97,007
Customer and supplier relationships	388,862		213,700		175,162		401,696		207,884		193,812
Other intangible assets	38,153		33,334		4,819		38,331		33,018		5,313
Total amortizable permits and other intangible assets	609,493		339,759		269,734		624,262		328,130		296,132
Trademarks and trade names	122,667		—		122,667		122,934		—		122,934
Total permits and other intangible assets	$	732,160	$	339,759	$	392,401	$	747,196	$	328,130	$	419,066

Schedule of Expected Amortization for the Net Carrying Amount of Finite Lived Intangible Assets

The expected amortization of the net carrying amount of finite-lived intangible assets at September 30, 2020 was as follows (in thousands):


Years Ending December 31,	Expected Amortization
2020 (three months)	$	7,841
2021	29,997
2022	29,742
2023	25,482
2024	23,997
Thereafter	152,675
	$	269,734

ACCRUED EXPENSES (Tables)

9 Months Ended

Sep. 30, 2020

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consisted of the following (in thousands):


	September 30, 2020		December 31, 2019
Accrued insurance	$	77,985	$	74,376
Accrued interest	9,179		21,222
Accrued compensation and benefits	60,784		72,473
Accrued income, real estate, sales and other taxes	54,677		35,749
Interest rate swap liability	36,649		20,840
Accrued other	53,926		51,880
	$	293,200	$	276,540

CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2020

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Closure and Post-Closure Liabilities

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2020 through September 30, 2020 were as follows (in thousands):


	Landfill Retirement Liability		Non-Landfill Retirement Liability		Total
Balance at January 1, 2020	$	39,401	$	36,250	$	75,651
Liabilities assumed in acquisitions	—		265		265

New asset retirement obligations	1,643		—		1,643

Accretion	2,373		2,516		4,889
Changes in estimates recorded to statement of operations	4,503		(14)		4,489
Changes in estimates recorded to balance sheet	179		15		194
Expenditures	(2,116)		(622)		(2,738)
Currency translation and other	(133)		(44)		(177)
Balance at September 30, 2020	$	45,850	$	38,366	$	84,216

REMEDIAL LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2020

Environmental Remediation Obligations [Abstract]

Schedule of Changes to Remedial Liabilities

The changes to remedial liabilities from January 1, 2020 through September 30, 2020 were as follows (in thousands):


	Remedial Liabilities for Landfill Sites		Remedial Liabilities for Inactive Sites		Remedial Liabilities (Including Superfund) for Non-Landfill Operations		Total
Balance at January 1, 2020	$	1,851	$	61,991	$	50,331	$	114,173


Accretion	67		1,914		1,279		3,260
Changes in estimates recorded to statement of operations	(14)		3,023		1,552		4,561
Expenditures	(46)		(3,278)		(2,754)		(6,078)
Currency translation and other	—		(912)		563		(349)
Balance at September 30, 2020	$	1,858	$	62,738	$	50,971	$	115,567

FINANCING ARRANGEMENTS (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Schedule of the Entity's Financial Arrangements

The following table is a summary of the Company’s financing arrangements (in thousands):


Current Obligations:	September 30, 2020		December 31, 2019
Secured senior term loans ("Term Loans")	$	7,535	$	7,535

Long-Term Obligations:
Secured senior Term Loans due June 30, 2024	$	721,510	$	727,162
Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes")	545,000		545,000
Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes")	300,000		300,000
Long-term obligations, at par	$	1,566,510	$	1,572,162
Unamortized debt issuance costs and premium, net	(15,754)		(18,046)
Long-term obligations, at carrying value	$	1,550,756	$	1,554,116

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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+ Details

EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Schedule of Reconciliation of Basic and Diluted Earnings per Share Computations

The following are computations of basic and diluted earnings per share (in thousands, except per share amounts):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Numerator for basic and diluted earnings per share:
Net income	$	54,910	$	36,369	$	95,505	$	73,589

Denominator:
Basic shares outstanding	55,592		55,850		55,646		55,858
Dilutive effect of outstanding stock awards	146		315		186		251
Dilutive shares outstanding	55,738		56,165		55,832		56,109

Basic earnings per share:	$	0.99	$	0.65	$	1.72	$	1.32

Diluted earnings per share:	$	0.99	$	0.65	$	1.71	$	1.31

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Loss

The changes in accumulated other comprehensive loss by component and related tax impacts for the nine months ended September 30, 2020 were as follows (in thousands):


	Foreign Currency Translation		Unrealized Gains (Losses) on Available-For-Sale Securities		Unrealized Loss on Interest Rate Hedge		Unfunded Pension Liability		Total
Balance at January 1, 2020	$	(187,795)	$	143	$	(20,839)	$	(1,560)	$	(210,051)
Other comprehensive (loss) income before reclassifications and tax impacts	(15,044)		141		(21,505)		—		(36,408)
Amounts reclassified out of accumulated other comprehensive loss	—		—		5,696		—		5,696
Tax gain (loss)	1,349		(30)		—		—		1,319
Other comprehensive (loss) income, net of tax	(13,695)		111		(15,809)		—		(29,393)
Balance at September 30, 2020	$	(201,490)	$	254	$	(36,648)	$	(1,560)	$	(239,444)

Schedule of Reclassification Out of Accumulated Other Comprehensive Income


Other Comprehensive Income (Loss) Components	For the Three Months Ended September 30, 2020		For the Nine Months Ended September 30, 2020		Location

Unrealized loss on interest rate hedge	$	(2,468)	$	(5,696)	Interest expense, net of interest income

STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Restricted Stock Awards

The following table summarizes information about restricted stock awards for the nine months ended September 30, 2020:


Restricted Stock	Number of Shares	Weighted Average Grant-Date Fair Value
Balance at January 1, 2020	522,597	$	59.57
Granted	205,548	58.54
Vested	(199,476)	57.59
Forfeited	(38,515)	58.81
Balance at September 30, 2020	490,154	60.01

Schedule of Performance Stock Awards

The following table summarizes information about performance stock awards for the nine months ended September 30, 2020:


Performance Stock	Number of Shares	Weighted Average Grant-Date Fair Value
Balance at January 1, 2020	204,553	$	64.78
Granted	161,610	58.30
Vested	(23,222)	55.75
Forfeited	(16,330)	64.59
Balance at September 30, 2020	326,611	62.22

SEGMENT REPORTING (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

The following table reconciles third-party revenues to direct revenues for the three and nine months ended September 30, 2020 and September 30, 2019 (in thousands):


	For the Three Months Ended September 30, 2020								For the Three Months Ended September 30, 2019
	Third-party revenues		Intersegment revenues, net		Corporate Items, net		Direct revenues		Third-party revenues		Intersegment revenues, net		Corporate Items, net		Direct revenues
Environmental Services	$	498,183	$	29,448	$	339	$	527,970	$	550,122	$	35,274	$	1,476	$	586,872
Safety-Kleen	281,089		(29,448)		(1)		251,640		341,417		(35,274)		2		306,145
Corporate Items	72		—		(338)		(266)		129		—		(1,478)		(1,349)
Total	$	779,344	$	—	$	—	$	779,344	$	891,668	$	—	$	—	$	891,668


	For the Nine Months Ended September 30, 2020								For the Nine Months Ended September 30, 2019
	Third-party revenues		Intersegment revenues, net		Corporate Items, net		Direct revenues		Third-party revenues		Intersegment revenues, net		Corporate Items, net		Direct revenues
Environmental Services	$	1,490,641	$	97,782	$	2,823	$	1,591,246	$	1,550,114	$	105,555	$	3,301	$	1,658,970
Safety-Kleen	857,048		(97,782)		142		759,408		990,146		(105,555)		15		884,606
Corporate Items	218		—		(2,965)		(2,747)		925		—		(3,316)		(2,391)
Total	$	2,347,907	$	—	$	—	$	2,347,907	$	2,541,185	$	—	$	—	$	2,541,185

The following table presents certain assets by reportable segment and in the aggregate (in thousands):


	September 30, 2020		December 31, 2019
Property, plant and equipment, net:
Environmental Services	$	890,262	$	939,352
Safety-Kleen	559,178		555,310
Corporate Items	89,893		93,489
Total property, plant and equipment, net	$	1,539,333	$	1,588,151

Goodwill and Permits and other intangibles, net:
Environmental Services
Goodwill	$	211,139	$	212,531
Permits and other intangibles, net	80,535		89,722
Total Environmental Services	291,674		302,253

Safety-Kleen
Goodwill	$	313,122	$	312,482
Permits and other intangibles, net	311,866		329,344
Total Safety-Kleen	624,988		641,826

Total	$	916,662	$	944,079

Schedule of Reconciliation to Consolidated Statements of Income from Adjusted EBITDA

The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):


	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Adjusted EBITDA:
Environmental Services	$	140,854	$	121,658	$	387,851	$	329,036
Safety-Kleen	68,761		81,326		176,498		215,578
Corporate Items	(48,444)		(46,371)		(145,108)		(136,513)
Total	161,171		156,613		419,241		408,101
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,822		2,490		8,149		7,624
Depreciation and amortization	74,470		73,756		221,497		223,328

Income from operations	83,879		80,367		189,595		177,149
Other (income) expense, net	(2,268)		427		597		(1,992)
Loss on early extinguishment of debt	—		6,119		—		6,119
Loss on sale of businesses	118		—		3,376		—
Interest expense, net of interest income	17,407		19,702		54,848		59,681
Income before provision for income taxes	$	68,622	$	54,119	$	130,774	$	113,341

Schedule of Total Assets by Geographical Area

The following table presents the total assets by geographical area (in thousands):


	September 30, 2020		December 31, 2019
United States	$	3,452,839	$	3,413,254
Canada and other foreign	653,348		695,650
Total	$	4,106,187	$	4,108,904

SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Accounting Policies [Abstract]
Benefit amount under CARES Act and CEWS	$ 13.3	$ 36.7

REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 779,344	$ 891,668	$ 2,347,907	$ 2,541,185
Technical Services
Disaggregation of Revenue [Line Items]
Total revenues	257,612	292,506	774,814	820,333
Field and Emergency Response Services
Disaggregation of Revenue [Line Items]
Total revenues	115,989	95,546	349,254	253,894
Industrial Services and Other
Disaggregation of Revenue [Line Items]
Total revenues	124,654	162,199	366,791	476,812
Safety-Kleen Environmental Services
Disaggregation of Revenue [Line Items]
Total revenues	203,455	217,439	612,808	640,956
Safety-Kleen Oil
Disaggregation of Revenue [Line Items]
Total revenues	77,634	123,978	244,240	349,190
United States
Disaggregation of Revenue [Line Items]
Total revenues	666,649	764,352	2,044,523	2,188,327
Canada
Disaggregation of Revenue [Line Items]
Total revenues	112,695	127,316	303,384	352,858
Environmental Services
Disaggregation of Revenue [Line Items]
Total revenues	527,970	586,872	1,591,246	1,658,970
Safety-Kleen
Disaggregation of Revenue [Line Items]
Total revenues	251,640	306,145	759,408	884,606
Operating segments \| Environmental Services
Disaggregation of Revenue [Line Items]
Total revenues	498,183	550,122	1,490,641	1,550,114
Operating segments \| Environmental Services \| Technical Services
Disaggregation of Revenue [Line Items]
Total revenues	257,612	292,506	774,814	820,333
Operating segments \| Environmental Services \| Field and Emergency Response Services
Disaggregation of Revenue [Line Items]
Total revenues	115,989	95,546	349,254	253,894
Operating segments \| Environmental Services \| Industrial Services and Other
Disaggregation of Revenue [Line Items]
Total revenues	124,582	162,070	366,573	475,887
Operating segments \| Environmental Services \| Safety-Kleen Environmental Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating segments \| Environmental Services \| Safety-Kleen Oil
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating segments \| Environmental Services \| Oil, Gas and Lodging Services and Other
Disaggregation of Revenue [Line Items]
Total revenues		30,200		91,900
Operating segments \| Environmental Services \| United States
Disaggregation of Revenue [Line Items]
Total revenues	409,787	450,638	1,253,252	1,270,556
Operating segments \| Environmental Services \| Canada
Disaggregation of Revenue [Line Items]
Total revenues	88,396	99,484	237,389	279,558
Operating segments \| Safety-Kleen
Disaggregation of Revenue [Line Items]
Total revenues	281,089	341,417	857,048	990,146
Operating segments \| Safety-Kleen \| Technical Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating segments \| Safety-Kleen \| Field and Emergency Response Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating segments \| Safety-Kleen \| Industrial Services and Other
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Operating segments \| Safety-Kleen \| Safety-Kleen Environmental Services
Disaggregation of Revenue [Line Items]
Total revenues	203,455	217,439	612,808	640,956
Operating segments \| Safety-Kleen \| Safety-Kleen Oil
Disaggregation of Revenue [Line Items]
Total revenues	77,634	123,978	244,240	349,190
Operating segments \| Safety-Kleen \| United States
Disaggregation of Revenue [Line Items]
Total revenues	257,048	313,979	791,919	917,240
Operating segments \| Safety-Kleen \| Canada
Disaggregation of Revenue [Line Items]
Total revenues	24,041	27,438	65,129	72,906
Corporate
Disaggregation of Revenue [Line Items]
Total revenues	72	129	218	925
Corporate \| Technical Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate \| Field and Emergency Response Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate \| Industrial Services and Other
Disaggregation of Revenue [Line Items]
Total revenues	72	129	218	925
Corporate \| Safety-Kleen Environmental Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate \| Safety-Kleen Oil
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Corporate \| Oil, Gas and Lodging Services and Other
Disaggregation of Revenue [Line Items]
Total revenues		100		900
Corporate \| United States
Disaggregation of Revenue [Line Items]
Total revenues	(186)	(265)	(648)	531
Corporate \| Canada
Disaggregation of Revenue [Line Items]
Total revenues	$ 258	$ 394	$ 866	$ 394

REVENUES - Contract Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Receivables	$ 602,069	$ 644,738
Contract assets (unbilled receivables)	59,438	56,326
Contract liabilities (deferred revenue)	$ 67,412	$ 73,370

REVENUES - Narrative (Details)	9 Months Ended
REVENUES - Narrative (Details)	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Contract liability, recognition period	3 months

BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands				9 Months Ended
BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands	Apr. 17, 2020	May 31, 2019	Mar. 01, 2019	Sep. 30, 2020
Business Acquisition [Line Items]
Goodwill recognized				$ 1,440
2020 Acquisitions
Business Acquisition [Line Items]
Purchase price	$ 8,800
Goodwill recognized	$ 1,400
2019 Acquisitions
Business Acquisition [Line Items]
Purchase price		$ 14,800	$ 10,400
Goodwill recognized		$ 7,400	$ 5,200

INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Oil and oil related products	$ 77,808	$ 75,408
Supplies and drums	119,157	115,128
Solvent and solutions	10,290	9,973
Other	13,629	14,235
Total inventories and supplies	$ 220,884	$ 214,744

PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,644,204	$ 3,593,814
Less - accumulated depreciation and amortization	2,104,871	2,005,663
Total property, plant and equipment, net	1,539,333	1,588,151
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	139,184	131,023
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,185	15,924
Landfill assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	185,678	182,276
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	502,507	499,159
Right-of-Use assets, finance leases	8,000	31,000
Camp equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	154,427	158,277
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	819,583	785,056
Right-of-Use assets, finance leases	43,800	2,400
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,798,792	1,779,366
Right-of-Use assets, finance leases	9,100
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,920	6,054
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 20,928	$ 36,679

PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Abstract]
Depreciation inclusive of amortization	$ 64.9	$ 65.3	$ 193.9	$ 196.7

GOODWILL AND OTHER INTANGIBLE ASSETS - Rollforward of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2020	$ 525,013
Increase from current period acquisition	1,440
Measurement period adjustments from prior period acquisitions	23
Decrease from disposition of businesses	(674)
Foreign currency translation	(1,541)
Balance at September 30, 2020	524,261
Environmental Services
Goodwill [Roll Forward]
Balance at January 1, 2020	212,531
Increase from current period acquisition	0
Measurement period adjustments from prior period acquisitions	23
Decrease from disposition of businesses	(674)
Foreign currency translation	(741)
Balance at September 30, 2020	211,139
Safety-Kleen
Goodwill [Roll Forward]
Balance at January 1, 2020	312,482
Increase from current period acquisition	1,440
Measurement period adjustments from prior period acquisitions	0
Decrease from disposition of businesses	0
Foreign currency translation	(800)
Balance at September 30, 2020	$ 313,122

GOODWILL AND OTHER INTANGIBLE ASSETS - Amortizable Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	$ 609,493	$ 624,262
Accumulated Amortization	339,759	328,130
Finite-lived intangible assets, net	269,734	296,132
Total permits and other intangible assets, Cost	732,160	747,196
Total permits and other intangible assets, Net	392,401	419,066
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Trademarks and trade names	122,667	122,934
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	182,478	184,235
Accumulated Amortization	92,725	87,228
Finite-lived intangible assets, net	89,753	97,007
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	388,862	401,696
Accumulated Amortization	213,700	207,884
Finite-lived intangible assets, net	175,162	193,812
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets, cost	38,153	38,331
Accumulated Amortization	33,334	33,018
Finite-lived intangible assets, net	$ 4,819	$ 5,313

GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of permits and other intangible assets	$ 9.6	$ 8.4	$ 27.6	$ 26.6

GOODWILL AND OTHER INTANGIBLE ASSETS - Expected Future Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
2020 (three months)	$ 7,841
2021	29,997
2022	29,742
2023	25,482
2024	23,997
Thereafter	152,675
Finite-lived intangible assets, net	$ 269,734	$ 296,132

ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued insurance	$ 77,985	$ 74,376
Accrued interest	9,179	21,222
Accrued compensation and benefits	60,784	72,473
Accrued income, real estate, sales and other taxes	54,677	35,749
Interest rate swap liability	36,649	20,840
Accrued other	53,926	51,880
Total accrued expenses	$ 293,200	$ 276,540

CLOSURE AND POST-CLOSURE LIABILITIES (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) facility
Changes to post-closure liabilities
Balance at January 1, 2020	$ 75,651
Liabilities assumed in acquisitions	265
New asset retirement obligations	1,643
Accretion	4,889
Changes in estimates recorded to statement of operations	4,489
Changes in estimates recorded to balance sheet	194
Expenditures	(2,738)
Currency translation and other	(177)
Balance at September 30, 2020	$ 84,216
Number of active landfill facilities \| facility	10
Credit-adjusted risk-free rate	5.60%
Landfill Retirement Liability
Changes to post-closure liabilities
Balance at January 1, 2020	$ 39,401
Liabilities assumed in acquisitions	0
New asset retirement obligations	1,643
Accretion	2,373
Changes in estimates recorded to statement of operations	4,503
Changes in estimates recorded to balance sheet	179
Expenditures	(2,116)
Currency translation and other	(133)
Balance at September 30, 2020	45,850
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Balance at January 1, 2020	36,250
Liabilities assumed in acquisitions	265
New asset retirement obligations	0
Accretion	2,516
Changes in estimates recorded to statement of operations	(14)
Changes in estimates recorded to balance sheet	15
Expenditures	(622)
Currency translation and other	(44)
Balance at September 30, 2020	$ 38,366

REMEDIAL LIABILITIES (Details) $ in Thousands	9 Months Ended
REMEDIAL LIABILITIES (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2020	$ 114,173
Accretion	3,260
Changes in estimates recorded to statement of operations	4,561
Expenditures	(6,078)
Currency translation and other	(349)
Balance at September 30, 2020	115,567
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2020	1,851
Accretion	67
Changes in estimates recorded to statement of operations	(14)
Expenditures	(46)
Currency translation and other	0
Balance at September 30, 2020	1,858
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2020	61,991
Accretion	1,914
Changes in estimates recorded to statement of operations	3,023
Expenditures	(3,278)
Currency translation and other	(912)
Balance at September 30, 2020	62,738
Increase of remedial liabilities	3,300
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2020	50,331
Accretion	1,279
Changes in estimates recorded to statement of operations	1,552
Expenditures	(2,754)
Currency translation and other	563
Balance at September 30, 2020	50,971
Remedial Liabilities for a Superfund site
Accrual for Environmental Loss Contingencies [Roll Forward]
Increase of remedial liabilities	$ 1,800

FINANCING ARRANGEMENTS - Summary of Financing Arrangements (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 7,535	$ 7,535
Long-term obligations	1,566,510	1,572,162
Unamortized debt issuance costs and premium, net	(15,754)	(18,046)
Long-term obligations, at carrying value	1,550,756	1,554,116
Secured debt \| Term Loan Agreement
Debt Instrument [Line Items]
Current portion of long-term obligations	7,535	7,535
Long-term obligations	721,510	727,162
Unsecured debt \| Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes")
Debt Instrument [Line Items]
Long-term obligations	$ 545,000	$ 545,000
Interest rate (as a percentage)	4.875%	4.875%
Unsecured debt \| Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes")
Debt Instrument [Line Items]
Long-term obligations	$ 300,000	$ 300,000
Interest rate (as a percentage)	5.125%	5.125%

FINANCING ARRANGEMENTS - Narrative (Details) - USD ($)				9 Months Ended
FINANCING ARRANGEMENTS - Narrative (Details) - USD ($)	Jul. 28, 2020	Jun. 29, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Debt fair value				$ 1,600,000,000		$ 1,600,000,000
Borrowing from revolving credit facility				150,000,000	$ 0
Repayments of borrowings				150,000,000	$ 0
Available to borrow and outstanding letters of credit				249,100,000		229,200,000
Outstanding letters of credit				$ 123,500,000		146,900,000
Effective interest rate percentage				4.67%
Interest rate swap, liability				$ 36,600,000		$ 20,800,000
Interest Rate Swap
Debt Instrument [Line Items]
Notional amount of interest rate swap agreements				$ 350,000,000.0
Interest rate percentage				2.92%
Term Loans with Interest Rate Swap Agreements
Debt Instrument [Line Items]
Debt outstanding				$ 350,000,000.0
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Revolving credit facility maximum borrowing capacity				$ 400,000,000.0
Borrowing from revolving credit facility			$ 150,000,000.0
Repayments of borrowings	$ 75,000,000.0	$ 75,000,000.0

INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
INCOME TAXES (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Effective income tax rate	20.00%	32.80%	27.00%	35.10%
Unrecognized tax benefits	$ 5.2		$ 5.2		$ 6.4
Interest on unrecognized tax benefits	1.9		$ 1.9		$ 1.7
Released amount of uncertain tax positions during the period	1.1
Income tax refund received	$ 7.7

EARNINGS PER SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator for basic and diluted earnings per share:
Net income	$ 54,910	$ 29,023	$ 11,572	$ 36,369	$ 36,244	$ 976	$ 95,505	$ 73,589
Denominator:
Basic shares outstanding (in shares)	55,592			55,850			55,646	55,858
Dilutive effect of outstanding stock awards (in shares)	146			315			186	251
Dilutive shares outstanding (in shares)	55,738			56,165			55,832	56,109
Basic earnings per share (in USD per share)	$ 0.99			$ 0.65			$ 1.72	$ 1.32
Diluted earnings per share (in USD per share)	$ 0.99			$ 0.65			$ 1.71	$ 1.31

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

EARNINGS PER SHARE - Narrative (Details) - shares	3 Months Ended		9 Months Ended
EARNINGS PER SHARE - Narrative (Details) - shares	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Performance stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earning per share (in shares)	235,806	147,075	235,806	147,075
Restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of earning per share (in shares)	16,183	3,567	14,516	14,223

ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance beginning of period	$ 1,253,971	$ 1,205,805	$ 1,269,813	$ 1,209,467	$ 1,171,965	$ 1,169,756	$ 1,269,813	$ 1,169,756
Other comprehensive (loss) income before reclassifications and tax impacts							(36,408)
Amounts reclassified out of accumulated other comprehensive loss							5,696
Tax gain (loss)							1,319
Other comprehensive income (loss), net of tax	12,385	17,528	(59,306)	(9,419)	5,076	4,024	(29,393)	(319)
Balance ending of period	1,304,715	1,253,971	1,205,805	1,235,795	1,209,467	1,171,965	1,304,715	1,235,795
Foreign Currency Translation
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance beginning of period			(187,795)				(187,795)
Other comprehensive (loss) income before reclassifications and tax impacts							(15,044)
Amounts reclassified out of accumulated other comprehensive loss							0
Tax gain (loss)							1,349
Other comprehensive income (loss), net of tax							(13,695)
Balance ending of period	(201,490)						(201,490)
Unrealized Gains (Losses) on Available-For-Sale Securities
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance beginning of period			143				143
Other comprehensive (loss) income before reclassifications and tax impacts							141
Amounts reclassified out of accumulated other comprehensive loss							0
Tax gain (loss)							(30)
Other comprehensive income (loss), net of tax							111
Balance ending of period	254						254
Unrealized Loss on Interest Rate Hedge
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance beginning of period			(20,839)				(20,839)
Other comprehensive (loss) income before reclassifications and tax impacts							(21,505)
Amounts reclassified out of accumulated other comprehensive loss							5,696
Tax gain (loss)							0
Other comprehensive income (loss), net of tax							(15,809)
Balance ending of period	(36,648)						(36,648)
Unfunded Pension Liability
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance beginning of period			(1,560)				(1,560)
Other comprehensive (loss) income before reclassifications and tax impacts							0
Amounts reclassified out of accumulated other comprehensive loss							0
Tax gain (loss)							0
Other comprehensive income (loss), net of tax							0
Balance ending of period	(1,560)						(1,560)
Total
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance beginning of period	(251,829)	(269,357)	(210,051)	(214,271)	(219,347)	(223,371)	(210,051)	(223,371)
Other comprehensive income (loss), net of tax	12,385	17,528	(59,306)	(9,419)	5,076	4,024
Balance ending of period	$ (239,444)	$ (251,829)	$ (269,357)	$ (223,690)	$ (214,271)	$ (219,347)	$ (239,444)	$ (223,690)

ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Unrealized loss on interest rate hedge \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net of interest income	$ (2,468)	$ (5,696)

STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 03, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 6.7	$ 5.0	$ 12.7	$ 14.7
Income tax benefit	$ 1.7	$ 1.0	$ 2.9	$ 2.8
2020 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares originally authorized for issuance (in shares)					2,500,000

STOCK-BASED COMPENSATION - Restricted Stock Awards (Details) - Restricted stock awards - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Number of Shares
Beginning balance (in shares)			522,597
Granted (in shares)			205,548
Vested (in shares)			(199,476)
Forfeited (in shares)			(38,515)
Ending balance (in shares)	490,154		490,154
Weighted Average Grant-Date Fair Value
Beginning of period (in USD per share)			$ 59.57
Granted (in USD per share)			58.54
Vested (in USD per share)			57.59
Forfeited (in USD per share)			58.81
End of period (in USD per share)	$ 60.01		$ 60.01
Unrecognized compensation cost	$ 22.0		$ 22.0
Period for recognition (in years)			2 years 9 months
Fair value restricted stock	$ 3.1	$ 4.2	$ 12.8	$ 15.3

STOCK-BASED COMPENSATION - Performance Stock Awards (Details) - Performance stock awards - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Number of Shares
Beginning balance (in shares)			204,553
Granted (in shares)			161,610
Vested (in shares)	0	0	(23,222)
Forfeited (in shares)			(16,330)
Ending balance (in shares)	326,611		326,611
Weighted Average Grant-Date Fair Value
Beginning of period (in USD per share)			$ 64.78
Granted (in USD per share)			58.30
Vested (in USD per share)			55.75
Forfeited (in USD per share)			64.59
End of period (in USD per share)	$ 62.22		$ 62.22
Unrecognized compensation cost	$ 5.7		$ 5.7
Fair value restricted stock			$ 1.3	$ 2.9

COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Sep. 30, 2020 USD ($) proceeding	Sep. 30, 2020 USD ($) proceeding claim site	Dec. 31, 2012 CAD ($)	Dec. 31, 1999 municipality	Dec. 31, 1968 permit	Dec. 31, 2019 USD ($) proceeding
Loss Contingencies [Line Items]
Recorded reserves for actual or probable liabilities \| $	$ 29,900,000	$ 29,900,000				$ 26,000,000.0
Number of proceedings as defendant \| proceeding	69	69
Number of product liability claims settled or dismissed \| claim		10
Annual aggregate self-insured corridor retention \| $	$ 5,000,000.0	$ 5,000,000.0
Remedial Liabilities for Inactive Sites
Loss Contingencies [Line Items]
Increase of remedial liabilities \| $		3,300,000
Legal and Administrative Proceedings
Loss Contingencies [Line Items]
Recorded reserves for actual or probable liabilities \| $	24,100,000	$ 24,100,000				18,400,000
Ville Mercier
Loss Contingencies [Line Items]
Number of permits issued by government, for dumping organic liquid \| permit					2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec \| municipality				3
General damages sought \| $			$ 2.9
Punitive damages sought \| $			$ 10.0
Superfund Proceedings
Loss Contingencies [Line Items]
Number of sites owned by third party excluded from cleanup or related liabilities \| site		130
Number of sites owned by the entity subject to proceedings under federal or state superfund laws \| site		5
Number of sites owned by third parties \| site		125
Number of sites for which environmental remediation expense is settled \| site		31
Third party sites requiring expenditure on remediation \| site		15
Number of sites not currently requiring expenditures on remediation \| site		79
Minimum potential liability \| $	100,000	$ 100,000
Number of sites, potential liability exceeds substantial quota \| site		9
Notices received from owners of third parties sites seeking indemnifications from the company \| site		17
BR Facility \| Remedial Liabilities for Inactive Sites
Loss Contingencies [Line Items]
Increase of remedial liabilities \| $	3,300,000
ChemWaste
Loss Contingencies [Line Items]
Indemnification agreement with third party sites \| site		11
Kleen Performance Products
Loss Contingencies [Line Items]
Notices received from owners of third parties sites seeking indemnifications from the company \| site		6
Federal and State Enforcement Actions
Loss Contingencies [Line Items]
Recorded reserves for actual or probable liabilities \| $	$ 5,800,000	$ 5,800,000				$ 7,600,000
Number of proceedings as defendant \| proceeding	11	11				12
Minimum potential liability \| $	$ 100,000	$ 100,000				$ 100,000

SEGMENT REPORTING - Narrative (Details)	9 Months Ended
SEGMENT REPORTING - Narrative (Details)	Sep. 30, 2020 segment
Segment Reporting [Abstract]
Number of operating segments	2

SEGMENT REPORTING - Third Party Revenues to Direct Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 779,344	$ 891,668	$ 2,347,907	$ 2,541,185
Corporate
Segment Reporting Information [Line Items]
Total revenues	72	129	218	925
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(338)	(1,478)	(2,965)	(3,316)
Operating and Corporate non-segment
Segment Reporting Information [Line Items]
Total revenues	(266)	(1,349)	(2,747)	(2,391)
Environmental Services
Segment Reporting Information [Line Items]
Total revenues	527,970	586,872	1,591,246	1,658,970
Environmental Services \| Operating segments
Segment Reporting Information [Line Items]
Total revenues	498,183	550,122	1,490,641	1,550,114
Environmental Services \| Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	29,448	35,274	97,782	105,555
Environmental Services \| Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	339	1,476	2,823	3,301
Safety-Kleen
Segment Reporting Information [Line Items]
Total revenues	251,640	306,145	759,408	884,606
Safety-Kleen \| Operating segments
Segment Reporting Information [Line Items]
Total revenues	281,089	341,417	857,048	990,146
Safety-Kleen \| Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(29,448)	(35,274)	(97,782)	(105,555)
Safety-Kleen \| Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	$ (1)	$ 2	$ 142	$ 15

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

SEGMENT REPORTING - Adjusted EBITDA Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 161,171	$ 156,613	$ 419,241	$ 408,101
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,822	2,490	8,149	7,624
Depreciation and amortization	74,470	73,756	221,497	223,328
Income from operations	83,879	80,367	189,595	177,149
Other (income) expense, net	(2,268)	427	597	(1,992)
Loss on early extinguishment of debt	0	6,119	0	6,119
Loss on sale of businesses	118	0	3,376	0
Interest expense, net of interest income	17,407	19,702	54,848	59,681
Income before provision for income taxes	68,622	54,119	130,774	113,341
Operating segments \| Environmental Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	140,854	121,658	387,851	329,036
Operating segments \| Safety-Kleen
Segment Reporting Information [Line Items]
Adjusted EBITDA	68,761	81,326	176,498	215,578
Corporate
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (48,444)	$ (46,371)	$ (145,108)	$ (136,513)

SEGMENT REPORTING - Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 1,539,333	$ 1,588,151
Goodwill	524,261	525,013
Permits and other intangibles, net	392,401	419,066
Goodwill and permits and other intangibles, net	916,662	944,079
Corporate
Segment Reporting Information [Line Items]
Property, plant and equipment, net	89,893	93,489
Environmental Services
Segment Reporting Information [Line Items]
Goodwill	211,139	212,531
Environmental Services \| Operating segments
Segment Reporting Information [Line Items]
Property, plant and equipment, net	890,262	939,352
Goodwill	211,139	212,531
Permits and other intangibles, net	80,535	89,722
Goodwill and permits and other intangibles, net	291,674	302,253
Safety-Kleen
Segment Reporting Information [Line Items]
Goodwill	313,122	312,482
Safety-Kleen \| Operating segments
Segment Reporting Information [Line Items]
Property, plant and equipment, net	559,178	555,310
Goodwill	313,122	312,482
Permits and other intangibles, net	311,866	329,344
Goodwill and permits and other intangibles, net	$ 624,988	$ 641,826

SEGMENT REPORTING - Total Assets by Geographical Area (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 4,106,187	$ 4,108,904
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	3,452,839	3,413,254
Canada and other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 653,348	$ 695,650

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

+ Details