Share Repurchase Programs (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Accelerated Share Repurchases [Line Items]
Aggregate cost of repurchased and retired	$ (40,437)
December 2013 Anti-Dilutive Share Repurchase Program [Member]
Accelerated Share Repurchases [Line Items]
Maximum number of share repurchases authorization	2,000,000
Aggregate cost of repurchased and retired	(40,437)
Common Stock [Member]
Accelerated Share Repurchases [Line Items]
Repurchased and retired shares	(562,683)
Aggregate cost of repurchased and retired	$ (281)