Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained (Deficit) Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2010	$ 285,182	$ 49	$ (2,344)	$ 218,744	$ 67,681	$ 1,052
Balance (in shares) at Dec. 31, 2010		49,278,000
Net income	71,993	0	0	0	71,993	0
Foreign currency translation	(609)	0	0	0	0	(609)
Interest rate swaps, net of tax	1,777	0	0	0	0	1,777
Repurchases of common stock, net of retirements (in shares)		(3,034,000)
Repurchases of common stock, net of retirements	(76,564)	(3)	2,344	0	(78,905)	0
Share-based compensation	8,233	0	0	8,233	0	0
Issuance of shares under incentive stock plans (in shares)		1,123,000
Issuance of shares under incentive stock plans, including tax benefit	16,204	1	0	16,203	0	0
Declaration of cash dividends	(26,470)	0	0	0	(26,470)	0
Balance at Dec. 31, 2011	279,746	47	0	243,180	34,299	2,220
Balance (in shares) at Dec. 31, 2011		47,367,000
Net income	81,972	0	0	0	81,972	0
Foreign currency translation	(534)	0	0	0	0	(534)
Interest rate swaps, net of tax	(1,820)	0	0	0	0	(1,820)
Repurchases of common stock, net of retirements (in shares)		(2,165,000)
Repurchases of common stock, net of retirements	(81,761)	(2)	0	0	(81,759)	0
Share-based compensation	8,465	0	0	8,465	0	0
Issuance of shares under incentive stock plans (in shares)		1,102,000
Issuance of shares under incentive stock plans, including tax benefit	24,690	1	0	24,689	0	0
Declaration of cash dividends	(29,135)	0	0	0	(29,135)	0
Balance at Dec. 31, 2012	281,623	46	0	276,334	5,377	(134)
Balance (in shares) at Dec. 31, 2012	46,303,728	46,304,000
Net income	97,330	0	0	0	97,330	0
Foreign currency translation	2,013	0	0	0	0	2,013
Interest rate swaps, net of tax	1,033	0	0	0	0	1,033
Repurchases of common stock, net of retirements (in shares)		(1,810,000)
Repurchases of common stock, net of retirements	(96,179)	(2)	0	0	(96,177)	0
Share-based compensation	8,150	0	0	8,150	0	0
Issuance of shares under incentive stock plans (in shares)		885,000
Issuance of shares under incentive stock plans, including tax benefit	26,020	1	0	26,019	0	0
Declaration of cash dividends	(33,808)	0	0	0	(33,808)	0
Balance at Dec. 31, 2013	$ 286,182	$ 45	$ 0	$ 310,503	$ (27,278)	$ 2,912
Balance (in shares) at Dec. 31, 2013	45,378,785	45,379,000