Change in Fair Value of Prior Year Awards that Forfeited During Year [Member] Michael L. Battles [Member] Change in Fair Value of Prior Year Awards Unvested as of Year-End [Member] Alan S. McKim [Member] Eric W. Gerstenberg [Member] Fair Value of Awards Granted During Year and Unvested as of Year-End [Member] Change in Fair Value of Prior Year Awards that Vested During Year [Member] Grant Date Fair Value of Stock Awards in Fiscal Year (from Summary Compensation Table) [Member]