Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Balance at Dec. 31, 2010	$ 127,501	$ 458	$ (782)	$ 77,449	$ (445)	$ 50,821
Balance, shares at Dec. 31, 2010		45,811	50
Net income	22,354					22,354
Unrealized loss on hedging derivative, net of taxes of $0	(1)				(1)
Common stock purchased for treasury	(22,369)		(22,369)
Common stock purchased for treasury, Shares			1,557
Exercise of stock options	603	1		602
Exercise of stock options, shares		50
Excess tax benefits from share-based compensation	80			80
Share-based compensation	3,130			3,130
Share-based compensation, shares		4
Balance at Jun. 30, 2011	$ 131,298	$ 459	$ (23,151)	$ 81,261	$ (446)	$ 73,175
Balance, shares at Jun. 30, 2011		45,865	1,607