Share Repurchase Programs (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Accelerated Share Repurchases [Line Items]
Common stock repurchases	$ 6,141
December 2013 Anti-Dilutive Share Repurchase Program [Member]
Accelerated Share Repurchases [Line Items]
Common stock repurchases	$ 6,100	$ 79,500
Common Stock [Member]
Accelerated Share Repurchases [Line Items]
Repurchased and retired shares	69,107.000
Common stock repurchases	$ 35
Common Stock [Member] | December 2013 Anti-Dilutive Share Repurchase Program [Member]
Accelerated Share Repurchases [Line Items]
Maximum number of share repurchases authorization (no more than 2 million)	2,000,000
Repurchased and retired shares	69,107	1,027,072