Change in Fair Value of Prior Year Stock Awards that Vested [Member] Year End Change In Fair Value of Prior Year Unvested Stock Awards [Member] Adjustment To Summary Compensation Table, Footnote Stock Awards [Member] Value of Dividends on Unvested Stock Awards [Member] Year End Fair Value of Unvested Stock Awards Granted [Member] Mr. Mazzei [Member] Fair Value of Stock Awards Forfeited [Member] Vesting Date Fair Value of Stock Awards Granted and Vested in the Same Year [Member] Mr. Witt [Member] Mr. Traenkle [Member]