Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2010	$ 348,372	$ 222	$ (65,675)	$ 363,402	$ 52,383	$ (1,960)
Beginning Balance, shares at Dec. 31, 2010		22,241,429
Comprehensive income:
Net income	13,525				13,525
Foreign currency translation adjustment, net of tax	603					603
Unrealized gain on cash flow hedging instrument, net of tax	307					307
Total comprehensive income	14,435
Issuance of common stock in connection with:
Restricted stock awards, net of cancellations		4	(4,182)	4,178
Restricted stock awards, net of cancellations, shares		375,427
Exercise of stock options	219	1		218
Exercise of stock options, shares		27,425
Settlement of class action lawsuit	13,648	5		13,643
Settlement of class action lawsuit, shares		474,547
Share-based compensation	10,126			10,126
Shares redeemed for employee tax withholdings	(2,531)		(2,531)
Income tax deficit on share-based compensation	(1,465)			(1,465)
Ending Balance at Jun. 30, 2011	$ 382,804	$ 232	$ (72,388)	$ 390,102	$ 65,908	$ (1,050)
Ending Balance, shares at Jun. 30, 2011		23,118,828