CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Income Statement [Abstract]
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
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 (benefit) expense	(854)		987	(6,704)	4,060
(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):
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
(Loss) income per share – basic:
Continuing operations per share - basic	$ (2.27)		$ 0.94	$ (3.38)	$ 7.65
Discontinued operations per share - basic	(1.00)		0.16	(1.13)	0.36
Net (loss) income per share - basic	(3.27)		1.10	(4.51)	8.01
(Loss) income per share – diluted:
Continuing operations per share - diluted	(2.27)		0.92	(3.38)	6.84
Discontinued operations per share - diluted	(1.00)		0.16	(1.13)	0.31
Net (loss) income per share - diluted	$ (3.27)		$ 1.08	$ (4.51)	$ 7.15
Weighted average shares outstanding:
Basic shares	8,578		8,552	8,564	8,518
Diluted shares	8,578		8,967	8,564	9,745