Stock-Based Compensation (Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units Outstanding at beginning of year		1,116,893	766,695	772,322
Units granted		292,776	666,172	190,846
Shares issued	[1]	(112,757)	(154,851)	(127,087)
Units forfeited		(109,128)	(161,123)	(69,386)
Units Outstanding at end of year		1,187,784	1,116,893	766,695
Units vested at end of year		290,754	303,276	311,546
Outstanding at beginning of year, Weighted Average Fair Value at Date of Grant	[2]	$ 29.36	$ 36.06	$ 32.57
Units granted, Weighted Average Fair Value at Date of Grant	[2]	22.53	27.22	49.82
Shares Issued, Weighted Average Fair Value at Date of Grant	[1],[2]	37.08	40.32	34.48
Units forfeited, Weighted Average Fair Value at Date of Grant	[2]	32.35	41.90	37.91
Outstanding at end of year, Weighted Average Fair Value at Date of Grant	[2]	26.67	29.36	36.06
Units vested at end of year, Weighted Average Fair Value at Date of Grant	[2]	$ 25.70	$ 25.50	$ 24.98

[1] Shares issued only include the Company’s common shares issued to satisfy RSU awards. See below or in Note 9 for information on the shares of Enova common stock distributed to satisfy applicable RSU awards.

[2] For RSU awards granted prior to the Enova Spin-off, the weighted average fair value at date of grant is based on the price of the Company's common stock and has not been adjusted for the Enova Spin-off.