Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Shares	Treasury Shares	Preferred Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss
Balance (in shares) (Predecessor) at Dec. 31, 2015		23,888	94
Beginning Balance (Predecessor) at Dec. 31, 2015	$ 46,988	$ 238	$ (964)		$ 226,844	$ (145,309)	$ (33,821)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss | Predecessor	(107,982)					(107,982)
Foreign currency translation, net of tax | Predecessor	494						494
Change in unrecognized pension and postretirement benefit costs, net of tax effect of $0, $0 and $(3,669) | Predecessor	7,388						7,388
Conversion of convertible notes (in shares) | Predecessor		8,576
Conversion of convertible notes | Predecessor	16,629	$ 86			16,543
Common stock warrants issued | Predecessor	200				200
Share-based compensation | Predecessor	882				882
Exercise of stock options and other (in shares) | Predecessor		(304)	(108)
Exercise of stock options and other | Predecessor	274	$ 3	$ (85)		356
Balance (in shares) (Predecessor) at Dec. 31, 2016		32,768	202	0
Ending Balance (Predecessor) at Dec. 31, 2016	(35,127)	$ 327	$ (1,049)		244,825	(253,291)	(25,939)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss | Predecessor	36,190					36,190
Foreign currency translation, net of tax | Predecessor	385						385
Change in unrecognized pension and postretirement benefit costs, net of tax effect of $0, $0 and $(3,669) | Predecessor	(1,008)						(1,008)
Share-based compensation | Predecessor	630				630
Exercise of stock options and other (in shares) | Predecessor			(80)
Exercise of stock options and other | Predecessor	62		$ (29)		91
Balance (in shares) (Predecessor) at Aug. 31, 2017		32,768	282	0
Balance (in shares) at Aug. 31, 2017		2,000	0
Ending Balance (Predecessor) at Aug. 31, 2017	1,132	$ 327	$ (1,078)		245,546	(217,101)	(26,562)
Ending Balance at Aug. 31, 2017	5,660	$ 20	$ 0		5,640	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cancellation of Predecessor equity (in shares)		(32,768)	(282)
Cancellation of Predecessor equity	(1,132)	$ (327)	$ 1,078		(245,546)	217,101	26,562
Net loss	(13,327)					(13,327)
Foreign currency translation, net of tax	(2,703)						(2,703)
Change in unrecognized pension and postretirement benefit costs, net of tax effect of $0, $0 and $(3,669)	34						34
Conversion of convertible notes	43,716				43,716
Share-based compensation	605				605
Exercise of stock options and other (in shares)		(1,734)
Exercise of stock options and other	0	$ 17			(17)
Balance (in shares) at Dec. 31, 2017		3,734	0
Ending Balance at Dec. 31, 2017	$ 33,985	$ 37	$ 0		$ 49,944	$ (13,327)	$ (2,669)