Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Statement of Comprehensive Income [Abstract]
Net sales	$ 331,249	$ 319,875	$ 551,615	$ 516,464
Cost of sales	250,234	247,862	428,697	410,036
Gross profit	81,015	72,013	122,918	106,428
Selling, general and administrative expenses	62,166	60,266	120,636	118,931
Income from operations	18,849	11,747	2,282	(12,503)
Interest expense, net	21,156	20,759	41,862	41,079
Foreign currency loss (gain)	601	278	1,117	616
Income (loss) before income taxes	(2,908)	(9,290)	(40,697)	(54,198)
Income tax expense	2,230	1,318	2,763	2,759
Net income (loss)	(5,138)	(10,608)	(43,460)	(56,957)
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	151	5	299	8
Foreign currency translation adjustments, net of tax	(1,379)	10,211	(12,965)	1,157
Total comprehensive income (loss)	$ (6,366)	$ (392)	$ (56,126)	$ (55,792)