Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Non-Owner Changes to Equity [Member]
Balance at Dec. 31, 2008	$ 598,574	$ 552	$ 269,215	$ (46,705)	$ 465,428	$ (89,916)
Balance (shares) at Dec. 31, 2008		55,230,000		(3,006,000)
Comprehensive income (loss):
Net income	39,001				39,001
Foreign currency translation adjustments, net of tax	28,399					28,399
Unrealized gains on hedging activities, net of tax	273					273
Pension and postretirement benefits adjustments, net of tax	11,748					11,748
Comprehensive income	79,421				39,001	40,420
Dividends paid	(25,600)				(25,600)
Stock contribution to pension plans, value	9,815		(6,555)	16,370
Stock contribution to pension plans, shares				737,463
Convertible note repurchases, value	12,788		(2,644)	15,432
Convertible note repurchases, shares				1,154,265
Common stock repurchases, value	(314)			(314)
Common stock repurchases, shares				(21,000)
Employee stock plans, value		8
Adjustments to Additional Paid in Capital, Other			10,768
Employee stock plans, shares		744,000
Employee stock plans, shares withheld for taxes				(47,000)
Employee stock plans, shares withheld for taxes, value				(622)
Dividends paid to holders of certain restricted stock units					(125)
Employee stock plans, value, total	10,029
Balance at Dec. 31, 2009	684,713	560	270,784	(15,839)	478,704	(49,496)
Balance (shares) at Dec. 31, 2009		55,974,000		(1,182,000)
Comprehensive income (loss):
Net income	53,278				53,278
Foreign currency translation adjustments, net of tax	16,973					16,973
Unrealized gains on hedging activities, net of tax	1,446					1,446
Pension and postretirement benefits adjustments, net of tax	(5,517)					(5,517)
Comprehensive income	66,180				53,278	12,902
Dividends paid	(17,461)				(17,461)
Convertible note repurchases, shares	0
Common stock repurchases, value	(28,100)			(28,100)
Common stock repurchases, shares				(1,484,000)
Employee stock plans, value		5
Adjustments to Additional Paid in Capital, Other			7,503
Employee stock plans, shares		544,000
Employee stock plans, shares withheld for taxes				(25,000)
Employee stock plans, shares withheld for taxes, value				(440)
Dividends paid to holders of certain restricted stock units					(281)
Employee stock plans, value, total	6,787
Balance at Dec. 31, 2010	712,119	565	278,287	(44,379)	514,240	(36,594)
Balance (shares) at Dec. 31, 2010		56,518,000		(2,691,000)
Comprehensive income (loss):
Net income	64,715				64,715
Foreign currency translation adjustments, net of tax	2,514					2,514
Unrealized gains on hedging activities, net of tax	381					381
Pension and postretirement benefits adjustments, net of tax	(41,355)					(41,355)
Comprehensive income	26,255				64,715	(38,460)
Dividends paid	(18,629)				(18,629)
Convertible note repurchases, shares	0
Common stock repurchases, value	(34,066)			(34,066)
Common stock repurchases, shares				(1,509,000)
Convertible debt redemption, net of tax	(5,238)		(5,238)
Employee stock plans, value		21
Adjustments to Additional Paid in Capital, Other			43,202
Employee stock plans, shares		2,076,000
Employee stock plans, shares withheld for taxes				(54,000)
Employee stock plans, shares withheld for taxes, value				(1,124)
Dividends paid to holders of certain restricted stock units					(140)
Employee stock plans, value, total	41,959
Balance at Dec. 31, 2011	$ 722,400	$ 586	$ 316,251	$ (79,569)	$ 560,186	$ (75,054)
Balance (shares) at Dec. 31, 2011		58,594,000		(4,254,000)