Consolidated Stockholders' Equity Statements (USD $) In Thousands	Total	Common Stock	Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss), Translation Component of Equity	Accumulated Other Comprehensive Income (Loss), Pension and Postretirement Liability
Beginning balance at Dec. 31, 2008	$ 570,868	$ 503	$ 585,704	$ 106,949	$ (132,515)	$ 45,675	$ (35,448)
Beginning balance, shares at Dec. 31, 2008		50,335			3,844
Net income (loss)	(24,901)			(24,901)
Foreign currency translation	12,385					12,385
Adjustments to pension and postretirement liability, net of $0.8, $1.0 and $4.8 million tax benefit for year 2009, 2010 and 2011 respectively	(7,998)						(7,998)
Comprehensive income/ loss	(20,514)
Exercise of stock options, net of tax withholding forfeitures	699		5		694
Exercise of stock options, net of tax withholding forfeitures, shares					33
Conversion of restricted stock units into common stock, net of tax withholding forfeitures	(797)		(4,007)		3,210
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares					136
Share-based compensation	10,184		10,184
Dividends ($0.20 per share)	(9,392)		31	(9,423)
Ending balance at Dec. 31, 2009	551,048	503	591,917	72,625	(128,611)	58,060	(43,446)
Ending balance, shares at Dec. 31, 2009		50,335			3,675
Net income (loss)	108,459			108,459
Foreign currency translation	(25,965)					(25,965)
Adjustments to pension and postretirement liability, net of $0.8, $1.0 and $4.8 million tax benefit for year 2009, 2010 and 2011 respectively	2,432						2,432
Comprehensive income/ loss	84,926
Exercise of stock options, net of tax withholding forfeitures	2,698		(1,322)		4,020
Exercise of stock options, net of tax withholding forfeitures, shares					177
Conversion of restricted stock units into common stock, net of tax withholding forfeitures	(2,731)		(7,166)		4,435
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares					208
Share-based compensation	12,067		12,067
Dividends ($0.20 per share)	(9,493)		23	(9,516)
Ending balance at Dec. 31, 2010	638,515	503	595,519	171,568	(120,156)	32,095	(41,014)
Ending balance, shares at Dec. 31, 2010		50,335			3,290
Net income (loss)	114,345			114,345
Foreign currency translation	(4,632)					(4,632)
Adjustments to pension and postretirement liability, net of $0.8, $1.0 and $4.8 million tax benefit for year 2009, 2010 and 2011 respectively	(9,158)						(9,158)
Comprehensive income/ loss	100,555
Exercise of stock options, net of tax withholding forfeitures	3,862		(2,214)		6,076
Exercise of stock options, net of tax withholding forfeitures, shares					264
Conversion of restricted stock units into common stock, net of tax withholding forfeitures	(1,864)		(4,852)		2,988
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares					151
Share repurchase program	(50,000)				(50,000)
Share repurchase program, shares	(1,635)				(1,635)
Share-based compensation	13,031		13,031
Dividends ($0.20 per share)	(9,550)			(9,550)
Ending balance at Dec. 31, 2011	$ 694,549	$ 503	$ 601,484	$ 276,363	$ (161,092)	$ 27,463	$ (50,172)
Ending balance, shares at Dec. 31, 2011		50,335			4,510