Stockholders' Equity (Details) (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2014
Stockholders' Equity
Dividends paid (in dollars per share)	$ 0.085	$ 0.085	$ 0.085	$ 0.085	$ 0.34	$ 0.255	$ 0.425
Common stock received by Company in lieu of cash from stock option exercises and vesting of non-vested shares (in shares)					108,159
Common stock received by Company in lieu of cash from stock option exercises and vesting of non-vested shares					$ 800,000
Stock Repurchase program
Common stock repurchased					7,894,000	1,662,000	4,402,000
2012 Stock Repurchase program
Stock Repurchase program
Common stock repurchased (in shares)					1,200,000
Common stock repurchased					7,900,000
Authorized amount to repurchase shares								20,000,000
Amount available to repurchase additional shares	$ 16,100,000				$ 16,100,000