Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Paid-In Capital	Accumulated Other Comprehensive Income	Retained (Deficit) Earnings	Treasury Stock
Beginning Balance at Dec. 31, 2008	$ 377,882	$ 911	$ 457,012	$ 1,296	$ (66,087)	$ (15,250)
Net income (loss)	(20,573)				(20,573)
Employee stock options, restricted stock and employee stock purchase plan	101	2	99
Stock-based compensation expense	3,437		3,437
Issuance of restricted stock and restricted stock units		4	(4)
Changes in fair value of interest rate swap, net of tax	452			452
Treasury shares purchased at cost	(164)					(164)
Foreign currency translation	6,887			6,887
Ending Balance at Dec. 31, 2009	368,022	917	460,544	8,635	(86,660)	(15,414)
Net income (loss)	41,626				41,626
Employee stock options, restricted stock and employee stock purchase plan	3,632	14	3,838			(220)
Stock-based compensation expense	3,876		3,876
Income tax effect, net, of employee stock related activity	245		245
Settlement of interest rate swap, net of tax	858			858
Treasury shares purchased at cost	(200)
Foreign currency translation	(912)			(912)
Ending Balance at Dec. 31, 2010	417,347	931	468,503	8,581	(45,034)	(15,634)
Net income (loss)	80,017				80,017
Employee stock options, restricted stock and employee stock purchase plan	3,147	14	3,574			(441)
Stock-based compensation expense	4,535		4,535
Income tax effect, net, of employee stock related activity	592		592
Treasury shares purchased at cost	(600)
Foreign currency translation	(7,792)			(7,792)
Ending Balance at Dec. 31, 2011	$ 497,846	$ 945	$ 477,204	$ 789	$ 34,983	$ (16,075)