Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Stockholders' Equity Note [Abstract]
Additional number of shares authorized for repurchase under the Stock Repurchase Program (in shares)	1,000,000				1,000,000
Shares repurchased under the program (in shares)					530,933
Shares withheld for tax withholding obligations for the vesting of restricted stock awards (in shares)					114,359
Authorized to repurchased additional shares under repurchase program (in shares)	1,237,832				1,237,832
Dividends declared per share of common stock (in dollars per share)	$ 0.22	$ 0.19	$ 0.19	$ 0.17
Payments of Dividends					$ 10,407	$ 9,203