Stockholders' Equity (Details) (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity
Dividends paid (in dollars per share)	$ 0.085	$ 0.085	$ 0.085	$ 0.085	$ 0.255	$ 0.43	$ 0.32
Common stock received by Company in lieu of cash from stock option exercises and vesting of non-vested shares (in shares)					52,555
Common stock received by Company in lieu of cash from stock option exercises and vesting of non-vested shares					$ 400,000
Stock Repurchase program
Common stock repurchased					1,662,000	4,402,000	8,363,000
2014 dividends
Planned Dividends
Planned quarterly dividend for each quarters (in dollars per share)	$ 0.085				$ 0.085
2012 Stock Repurchase program
Stock Repurchase program
Common stock repurchased (in shares)					200,000
Common stock repurchased					1,700,000
Authorized amount to repurchase shares					10,000,000
Amount available to repurchase additional shares					$ 3,900,000