Subsidiary Guarantors Condensed Consolidating Statement of Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Condensed Financial Statements, Captions [Line Items]
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, net	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
(Loss) income before equity income from subsidiaries	1,686	(5,138)	(26,326)	(43,460)
Equity income (loss) from subsidiaries	0	0	0	0
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)
Company
Condensed Financial Statements, Captions [Line Items]
Net sales	261,237	262,272	456,568	441,910
Cost of sales	198,191	201,659	354,406	350,626
Gross profit	63,046	60,613	102,162	91,284
Selling, general and administrative expenses	47,401	49,194	94,659	96,851
Restructuring costs	74		74
Other operating income	(732)		(732)
Income from operations	16,303	11,419	8,161	(5,567)
Interest expense, net	21,366	19,276	42,183	38,064
Foreign currency loss	0	0	0	0
Income (loss) before income taxes	(5,063)	(7,857)	(34,022)	(43,631)
Income tax expense	(93)	179	685	905
(Loss) income before equity income from subsidiaries	(4,970)	(8,036)	(34,707)	(44,536)
Equity income (loss) from subsidiaries	6,656	2,898	8,381	1,076
Net income (loss)	1,686	(5,138)	(26,326)	(43,460)
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	22	151	39	299
Foreign currency translation adjustments, net of tax	1,429	(1,379)	12,447	(12,965)
Total comprehensive income (loss)	3,137	(6,366)	(13,840)	(56,126)
Co-Issuer
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Restructuring costs			0
Other operating income	0		0
Income from operations	0	0	0	0
Interest expense, net	0	0	0	0
Foreign currency loss	0	0	0	0
Income (loss) before income taxes	0	0	0	0
Income tax expense	0	0	0	0
(Loss) income before equity income from subsidiaries	0	0	0	0
Equity income (loss) from subsidiaries	0	0	0	0
Net income (loss)	0	0	0	0
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	0	0	0	0
Foreign currency translation adjustments, net of tax	0	0	0	0
Total comprehensive income (loss)	0	0	0	0
Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Net sales	41,809	42,578	74,117	72,740
Cost of sales	37,936	41,001	67,831	69,807
Gross profit	3,873	1,577	6,286	2,933
Selling, general and administrative expenses	2,205	2,526	3,908	3,370
Restructuring costs			0
Other operating income	0		0
Income from operations	1,668	(949)	2,378	(437)
Interest expense, net	0	1,662	0	3,323
Foreign currency loss	0	0	0	0
Income (loss) before income taxes	1,668	(2,611)	2,378	(3,760)
Income tax expense	(26)	53	(45)	77
(Loss) income before equity income from subsidiaries	1,694	(2,664)	2,423	(3,837)
Equity income (loss) from subsidiaries	4,962	5,562	5,958	4,913
Net income (loss)	6,656	2,898	8,381	1,076
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	(46)	60	(11)	118
Foreign currency translation adjustments, net of tax	1,429	(1,379)	12,447	(12,965)
Total comprehensive income (loss)	8,039	1,579	20,817	(11,771)
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	72,442	77,477	120,299	124,725
Cost of sales	53,356	58,652	89,689	96,024
Gross profit	19,086	18,825	30,610	28,701
Selling, general and administrative expenses	11,556	10,446	22,028	20,415
Restructuring costs			0
Other operating income	0		0
Income from operations	7,530	8,379	8,582	8,286
Interest expense, net	252	218	318	475
Foreign currency loss	548	601	165	1,117
Income (loss) before income taxes	6,730	7,560	8,099	6,694
Income tax expense	1,768	1,998	2,141	1,781
(Loss) income before equity income from subsidiaries	4,962	5,562	5,958	4,913
Equity income (loss) from subsidiaries	0	0	0	0
Net income (loss)	4,962	5,562	5,958	4,913
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	41	50	81	98
Foreign currency translation adjustments, net of tax	1,429	(1,379)	12,447	(12,965)
Total comprehensive income (loss)	6,432	4,233	18,486	(7,954)
Reclassification/ Eliminations
Condensed Financial Statements, Captions [Line Items]
Net sales	(51,699)	(51,078)	(90,914)	(87,760)
Cost of sales	(51,699)	(51,078)	(90,914)	(87,760)
Gross profit	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Restructuring costs			0
Other operating income	0		0
Income from operations	0	0	0	0
Interest expense, net	0	0	0	0
Foreign currency loss	0	0	0	0
Income (loss) before income taxes	0	0	0	0
Income tax expense	0	0	0	0
(Loss) income before equity income from subsidiaries	0	0	0	0
Equity income (loss) from subsidiaries	(11,618)	(8,460)	(14,339)	(5,989)
Net income (loss)	(11,618)	(8,460)	(14,339)	(5,989)
Other comprehensive income (loss):
Pension and other postretirement benefit adjustments, net of tax	0	(110)	(75)	(216)
Foreign currency translation adjustments, net of tax	(2,858)	2,758	(24,894)	25,930
Total comprehensive income (loss)	$ (14,476)	$ (5,812)	$ (39,308)	$ 19,725