Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	May. 29, 2015
Stockholders' Equity Note [Abstract]
Additional number of shares authorized for repurchase under the Stock Repurchase Program (in shares)									1,000,000
Shares repurchased under the program (in shares)							1,065,692
Shares withheld for tax withholding obligations for the vesting of restricted stock awards (in shares)							114,523
Authorized to repurchased additional shares under repurchase program (in shares)	703,073						703,073
Dividends declared per share of common stock (in dollars per share)	$ 0.22	$ 0.22	$ 0.19	$ 0.19	$ 0.19	$ 0.17
Payments of Dividends							$ 15,812	$ 14,015