Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Statement of Comprehensive Income [Abstract]
Net sales	$ 323,789	$ 331,249	$ 560,070	$ 551,615
Cost of sales	237,784	250,234	421,012	428,697
Gross profit	86,005	81,015	139,058	122,918
Selling, general and administrative expenses	61,162	62,166	120,595	120,636
Restructuring costs	74	0	74	0
Other operating income	(732)	0	(732)	0
Income from operations	25,501	18,849	19,121	2,282
Interest expense	21,618	21,156	42,501	41,862
Foreign currency loss	548	601	165	1,117
Income (loss) before income taxes	3,335	(2,908)	(23,545)	(40,697)
Income tax expense	1,649	2,230	2,781	2,763
Net income (loss)	1,686	(5,138)	(26,326)	(43,460)
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	17	151	34	299
Foreign currency translation adjustments, net of tax	1,429	(1,379)	12,447	(12,965)
Total comprehensive income (loss)	$ 3,132	$ (6,366)	$ (13,845)	$ (56,126)