Stock Repurchases (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 21, 2013	Jun. 30, 2011
Stock Repurchases [Abstract]
Stock Repurchase Program, Authorized Repurchase Amount				$ 100,000,000	$ 100,000,000
Stock Repurchased During Period, Shares	2,146,488	250,900	983,818
Payments for Repurchase of Common Stock	(31,854,000)	(2,492,000)	(18,374,000)
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 71,000,000