Condensed Consolidating Financial Information (Condensed Consolidating Statement of Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 329,511	$ 353,817	$ 382,675	$ 1,010,850	$ 1,162,903
Cost of sales	277,588	$ 292,389	314,783	840,996	965,553
Selling, general and administrative expenses	41,183		44,082	123,397	133,042
Amortization of intangible assets	1,209		1,325	3,830	4,201
Restructuring and other charges	10,025		2,326	20,040	8,196
Operating (loss) income	(494)		20,159	22,587	51,911
Interest expense, net	19,472		20,318	58,144	65,925
Intercompany interest (income) expense	0		0	0	0
Loss (gain) on early extinguishment of debt, net	38		(7,442)	146	(80,328)
Other expense (income), net	293		(1,763)	(77)	(2,893)
(Loss) income from continuing operations before income tax (benefit) expense	(20,297)		9,046	(35,626)	69,207
Income tax expense (benefit)	(854)		987	(6,704)	4,060
Income (loss) from continuing operations before equity in (loss) income of subsidiaries	(19,443)		8,059	(28,922)	65,147
Equity in (loss) income of subsidiaries	0		0	0	0
(Loss) income from continuing operations	(19,443)		8,059	(28,922)	65,147
(Loss) income from discontinued operations, net of taxes	(8,607)		1,372	(9,671)	3,043
Net (loss) income	(28,050)		9,431	(38,593)	68,190
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	0		0	0	0
Changes in pension and other employee benefit accounts, net of taxes	4,665		2,507	7,854	7,467
Currency translation adjustment, net	(98)		557	410	2,142
Total other comprehensive income	4,567		3,064	8,264	9,609
Comprehensive (loss) income	(23,483)		12,495	(30,329)	77,799
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	0		0	0	0
Cost of sales	0		0	0	0
Selling, general and administrative expenses	0		0	0	0
Amortization of intangible assets	0		0	0	0
Restructuring and other charges	0		0	0	0
Operating (loss) income	0		0	0	0
Interest expense, net	0		0	0	0
Intercompany interest (income) expense	0		0	0	0
Loss (gain) on early extinguishment of debt, net	0		0	0	0
Other expense (income), net	0		0	0	0
(Loss) income from continuing operations before income tax (benefit) expense	0		0	0	0
Income tax expense (benefit)	0		0	0	0
Income (loss) from continuing operations before equity in (loss) income of subsidiaries	0		0	0	0
Equity in (loss) income of subsidiaries	(28,050)		9,431	(38,593)	68,190
(Loss) income from continuing operations	(28,050)		9,431	(38,593)	68,190
(Loss) income from discontinued operations, net of taxes	0		0	0	0
Net (loss) income	(28,050)		9,431	(38,593)	68,190
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	4,567		3,064	8,264	9,609
Changes in pension and other employee benefit accounts, net of taxes	0		0	0	0
Currency translation adjustment, net	0		0	0	0
Total other comprehensive income	4,567		3,064	8,264	9,609
Comprehensive (loss) income	(23,483)		12,495	(30,329)	77,799
Subsidiary Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	158,476		188,245	492,942	574,496
Cost of sales	106,101		163,516	401,358	508,140
Selling, general and administrative expenses	24,589		26,377	75,583	80,738
Amortization of intangible assets	93		98	280	292
Restructuring and other charges	1,385		2,493	9,881	6,270
Operating (loss) income	26,308		(4,239)	5,840	(20,944)
Interest expense, net	19,306		20,272	57,799	65,779
Intercompany interest (income) expense	(309)		(249)	(886)	(740)
Loss (gain) on early extinguishment of debt, net	38		(7,442)	146	(80,328)
Other expense (income), net	488		(1,905)	464	(945)
(Loss) income from continuing operations before income tax (benefit) expense	6,785		(14,915)	(51,683)	(4,710)
Income tax expense (benefit)	1,703		774	(4,546)	2,827
Income (loss) from continuing operations before equity in (loss) income of subsidiaries	5,082		(15,689)	(47,137)	(7,537)
Equity in (loss) income of subsidiaries	(24,525)		24,927	18,215	70,889
(Loss) income from continuing operations	(19,443)		9,238	(28,922)	63,352
(Loss) income from discontinued operations, net of taxes	(8,607)		193	(9,671)	4,838
Net (loss) income	(28,050)		9,431	(38,593)	68,190
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	(6)		363	682	2,401
Changes in pension and other employee benefit accounts, net of taxes	4,573		2,701	7,582	7,208
Currency translation adjustment, net	0		0	0	0
Total other comprehensive income	4,567		3,064	8,264	9,609
Comprehensive (loss) income	(23,483)		12,495	(30,329)	77,799
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	170,214		193,945	515,754	587,116
Cost of sales	171,487		151,267	439,638	457,413
Selling, general and administrative expenses	16,385		17,526	47,177	51,747
Amortization of intangible assets	1,116		1,116	3,337	3,576
Restructuring and other charges	8,640		(167)	10,159	1,926
Operating (loss) income	(27,414)		24,203	15,443	72,454
Interest expense, net	166		46	345	146
Intercompany interest (income) expense	309		249	886	740
Loss (gain) on early extinguishment of debt, net	0		0	0	0
Other expense (income), net	(165)		100	(604)	(1,848)
(Loss) income from continuing operations before income tax (benefit) expense	(27,724)		23,808	14,816	73,416
Income tax expense (benefit)	(2,895)		160	(2,586)	402
Income (loss) from continuing operations before equity in (loss) income of subsidiaries	(24,829)		23,648	17,402	73,014
Equity in (loss) income of subsidiaries	304		163	813	715
(Loss) income from continuing operations	(24,525)		23,811	18,215	73,729
(Loss) income from discontinued operations, net of taxes	0		1,116	0	(2,840)
Net (loss) income	(24,525)		24,927	18,215	70,889
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	(165)		213	649	140
Changes in pension and other employee benefit accounts, net of taxes	92		(194)	272	259
Currency translation adjustment, net	67		344	(239)	2,002
Total other comprehensive income	(6)		363	682	2,401
Comprehensive (loss) income	(24,531)		25,290	18,897	73,290
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	821		485	2,154	1,291
Cost of sales	0		0	0	0
Selling, general and administrative expenses	209		179	637	557
Amortization of intangible assets	0		111	213	333
Restructuring and other charges	0		0	0	0
Operating (loss) income	612		195	1,304	401
Interest expense, net	0		0	0	0
Intercompany interest (income) expense	0		0	0	0
Loss (gain) on early extinguishment of debt, net	0		0	0	0
Other expense (income), net	(30)		42	63	(100)
(Loss) income from continuing operations before income tax (benefit) expense	642		153	1,241	501
Income tax expense (benefit)	338		53	428	831
Income (loss) from continuing operations before equity in (loss) income of subsidiaries	304		100	813	(330)
Equity in (loss) income of subsidiaries	0		0	0	0
(Loss) income from continuing operations	304		100	813	(330)
(Loss) income from discontinued operations, net of taxes	0		63	0	1,045
Net (loss) income	304		163	813	715
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	0		0	0	0
Changes in pension and other employee benefit accounts, net of taxes	0		0	0	0
Currency translation adjustment, net	(165)		213	649	140
Total other comprehensive income	(165)		213	649	140
Comprehensive (loss) income	139		376	1,462	855
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	0		0	0	0
Cost of sales	0		0	0	0
Selling, general and administrative expenses	0		0	0	0
Amortization of intangible assets	0		0	0	0
Restructuring and other charges	0		0	0	0
Operating (loss) income	0		0	0	0
Interest expense, net	0		0	0	0
Intercompany interest (income) expense	0		0	0	0
Loss (gain) on early extinguishment of debt, net	0		0	0	0
Other expense (income), net	0		0	0	0
(Loss) income from continuing operations before income tax (benefit) expense	0		0	0	0
Income tax expense (benefit)	0		0	0	0
Income (loss) from continuing operations before equity in (loss) income of subsidiaries	0		0	0	0
Equity in (loss) income of subsidiaries	52,271		(34,521)	19,565	(139,794)
(Loss) income from continuing operations	52,271		(34,521)	19,565	(139,794)
(Loss) income from discontinued operations, net of taxes	0		0	0	0
Net (loss) income	52,271		(34,521)	19,565	(139,794)
Other comprehensive income (loss):
Other comprehensive income (loss) of subsidiaries	(4,396)		(3,640)	(9,595)	(12,150)
Changes in pension and other employee benefit accounts, net of taxes	0		0	0	0
Currency translation adjustment, net	0		0	0	0
Total other comprehensive income	(4,396)		(3,640)	(9,595)	(12,150)
Comprehensive (loss) income	$ 47,875		$ (38,161)	$ 9,970	$ (151,944)