Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Accumulated Other Comprehensive Loss	Additional Paid-In Capital	Treasury Stock, at Cost	Accumulated Deficit
Balance (in shares) at Dec. 31, 2013		13,444
Balance at Dec. 31, 2013	$ 133,872	$ 134	$ (181,931)	$ 565,441	$ (9,796)	$ (239,976)
Stockholders' Equity Line Items
Amortization, issuance and forfeitures of restricted stock grants (in shares)		136
Amortization, issuance and forfeitures of restricted stock grants	4,817	$ 2		4,815
Changes in pension liabilities and other post-retirement benefit obligations, net of tax	(51,963)		(51,963)
Foreign currency translation adjustments, net of tax	(1,928)		(1,928)
Purchases of treasury stock	(60,579)				(60,579)
Net (loss) income	25,170					25,170
Balance (in shares) at Dec. 31, 2014		13,580
Balance at Dec. 31, 2014	49,389	$ 136	(235,822)	570,256	(70,375)	(214,806)
Stockholders' Equity Line Items
Amortization, issuance and forfeitures of restricted stock grants (in shares)		1
Amortization, issuance and forfeitures of restricted stock grants	3,610	$ 0		3,610
Changes in pension liabilities and other post-retirement benefit obligations, net of tax	(21,950)		(21,950)
Foreign currency translation adjustments, net of tax	(1,620)		(1,620)
Treasury shares issued in JPS acquisition	48,748			12,827	35,921
Net (loss) income	106,363					106,363
Balance (in shares) at Dec. 31, 2015		13,579
Balance at Dec. 31, 2015	184,540	$ 136	(259,392)	586,693	(34,454)	(108,443)
Stockholders' Equity Line Items
Amortization, issuance and forfeitures of restricted stock grants (in shares)		48
Amortization, issuance and forfeitures of restricted stock grants	1,012	$ 0		1,012
Changes in pension liabilities and other post-retirement benefit obligations, net of tax	(5,383)		(5,383)
Foreign currency translation adjustments, net of tax	(2,232)		(2,232)
Purchases of treasury stock	(398)			0	(398)
Net (loss) income	(10,944)					(10,944)
Balance (in shares) at Dec. 31, 2016		13,627
Balance at Dec. 31, 2016	$ 166,595	$ 136	$ (267,007)	$ 587,705	$ (34,852)	$ (119,387)