Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 5,660
Other comprehensive income (loss) before reclassifications, net of tax	(2,669)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0
Net current period other comprehensive income (loss)	(2,669)
Adjustment for fresh-start accounting	0
Ending Balance	33,985	$ 5,660
Predecessor
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	1,132	(35,127)	$ 46,988
Other comprehensive income (loss) before reclassifications, net of tax		385	6,059
Amounts reclassified from accumulated other comprehensive loss, net of tax		(1,008)	1,823
Net current period other comprehensive income (loss)		(623)	7,882
Adjustment for fresh-start accounting		26,562	0
Ending Balance		1,132	(35,127)
Defined Benefit Pension and Postretirement Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0
Other comprehensive income (loss) before reclassifications, net of tax	34
Amounts reclassified from accumulated other comprehensive loss, net of tax	0
Net current period other comprehensive income (loss)	34
Adjustment for fresh-start accounting	0
Ending Balance	34	0
Defined Benefit Pension and Postretirement Items | Predecessor
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0	(9,797)	(17,185)
Other comprehensive income (loss) before reclassifications, net of tax		0	5,565
Amounts reclassified from accumulated other comprehensive loss, net of tax		(1,008)	1,823
Net current period other comprehensive income (loss)		(1,008)	7,388
Adjustment for fresh-start accounting		10,805	0
Ending Balance		0	(9,797)
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0
Other comprehensive income (loss) before reclassifications, net of tax	(2,703)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0
Net current period other comprehensive income (loss)	(2,703)
Adjustment for fresh-start accounting	0
Ending Balance	(2,703)	0
Foreign Currency Items | Predecessor
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0	(16,142)	(16,636)
Other comprehensive income (loss) before reclassifications, net of tax		385	494
Amounts reclassified from accumulated other comprehensive loss, net of tax		0	0
Net current period other comprehensive income (loss)		385	494
Adjustment for fresh-start accounting		15,757	0
Ending Balance		0	(16,142)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0
Ending Balance	(2,669)	0
Total | Predecessor
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (26,562)	(25,939)	(33,821)
Ending Balance		$ (26,562)	$ (25,939)