Consolidated Statement of Stockholders Equity (USD $) In Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Beginning balance at Dec. 31, 2011	$ 163,293	$ 460	$ (23,894)	$ 85,720	$ (360)	$ 101,367
Beginning Balance, shares at Dec. 31, 2011		45,955	1,657
Net income	48,538					48,538
Unrealized gain on hedging derivative, net of taxes of $72	95				95
Common stock purchased for treasury	(4,925)	(28,819)	(4,925)
Common stock purchased for treasury, shares	298		298
Restricted shares forfeited
Restricted shares forfeited, Shares			7
Exercise of stock options	4,339	3		4,336
Exercise of stock options, shares	339	339
Excess tax benefits from share-based compensation	140			140
Share-based compensation	5,748	6		5,742
Share-based compensation, shares		570
Ending balance at Sep. 30, 2012	$ 217,228	$ 469	$ (28,819)	$ 95,938	$ (265)	$ 150,210
Ending balance, shares at Sep. 30, 2012		46,864	1,962