Condensed Consolidated Stockholders' Equity Statement (Unaudited) - 3 months ended Apr. 03, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2015	$ 824,099	$ 503	$ 605,660	$ 679,716	$ (402,793)	$ (58,987)	$ 1,424
Beginning balance, Treasury shares at Dec. 31, 2015					(8,354)
Beginning balance, shares at Dec. 31, 2015		50,335
Net income (loss)	16,425			16,524			(99)
Foreign currency translation	(2,187)					(2,185)	(2)
Adjustments to pension and postretirement liability, net of $0.3 million tax	467					467
Other comprehensive income (loss), net of tax	(1,720)
Exercise of stock options, net of tax withholding forfeitures	(63)		(49)		$ (14)
Exercise of stock options, net of tax withholding forfeitures, shares					2
Conversion of restricted stock units into common stock, net of tax withholding forfeitures	(2,770)		(3,053)		$ 283
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares					77
Share-based compensation	4,033		4,033
Dividends ($0.05 per share)	(2,121)			(2,121)
Ending balance at Apr. 03, 2016	$ 837,984	$ 503	$ 606,591	$ 694,119	$ (402,524)	$ (60,705)	$ 1,323
Ending balance, Treasury shares at Apr. 03, 2016					(8,275)
Ending balance, shares at Apr. 03, 2016		50,335