Stock Repurchases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 19, 2015	Jun. 21, 2013
Stock Repurchases [Abstract]
Stock Repurchase Program, Authorized Repurchase Amount				$ 100,000,000	$ 100,000,000
Repurchase of common stock, Shares	(2,924,306)
Stock Repurchased During Period, Shares		2,146,488	250,900
Stock Repurchased and Retired During Period, Value	$ 82,473,000	$ 31,854,000	$ 2,492,000
Payments for Repurchase of Common Stock	(81,653,000)	$ (31,854,000)	$ (2,492,000)
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 88,600,000