CONDENSED CONSOLIDATED STOCKHOLDERS' EQUITY STATEMENT (Unaudited) (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2013	$ 836,541	$ 503	$ 585,753	$ 556,214	$ (276,748)	$ (29,181)
Beginning balance, shares at Dec. 31, 2013		50,335			6,880
Net income	24,609			24,609
Foreign currency translation, net of $0.2 million tax	261					261
Adjustment to pension and postretirement liability, net of $1.4 million tax	2,305					2,305
Other comprehensive income, net of tax	2,566
Exercise of stock options, net of tax withholding forfeitures	(5,810)		(8,130)		2,320
Exercise of stock options, net of tax withholding forfeitures, shares					136
Conversion of restricted stock units into common stock, net of tax withholding forfeitures	(1,931)		(3,721)		1,790
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares					72
Share repurchase program	(31,197)				(31,197)
Share repurchase program, shares					(424)
Share-based compensation	14,418		14,418
Dividends ($0.10 per share)	(4,420)			(4,420)
Ending balance at Jun. 29, 2014	$ 834,776	$ 503	$ 588,320	$ 576,403	$ (303,835)	$ (26,615)
Ending balance, shares at Jun. 29, 2014		50,335			7,096