CONDENSED CONSOLIDATED STOCKHOLDERS' EQUITY STATEMENT (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Component [Member]	Accumulated Other Comprehensive Income (Loss), Pension and Postretirement Benefit Plans [Member]
Beginning balance at Dec. 31, 2012	$ 811,860	$ 503	$ 598,180	$ 461,756	$ (218,014)	$ 28,516	$ (59,081)
Beginning balance, shares at Dec. 31, 2012		50,335			(6,167)
Net income	51,737			51,737
Foreign currency translation	(15,269)					(15,269)
Amortization of pension and other postretirement benefit plan losses, net of $1.5 million tax	2,374						2,374
Exercise of stock options, net of tax withholding, shares					490
Exercise of stock options, net of tax withholding	1,649		(16,867)		18,516
Conversion of restricted stock units into common stock, net of tax withholding, shares					120
Conversion of restricted stock units into common stock, net of tax withholding	(2,815)		(7,012)		4,197
Share repurchase program	(62,500)				(62,500)
Share repurchase program, shares					(1,197)
Share-based compensation	12,728		12,728
Dividends ($0.10 per share)	(4,452)			(4,452)
Ending balance at Jun. 30, 2013	$ 795,312	$ 503	$ 587,029	$ 509,041	$ (257,801)	$ 13,247	$ (56,707)
Ending balance, shares at Jun. 30, 2013		50,335			(6,754)