Loss Per Share - Reconciliations of Basic and Diluted Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net loss		$ (8,513)		$ (13,654)
Denominator:
Weighted average common shares outstanding (in shares)		2,000		2,000
Effect of dilutive securities:
Outstanding common stock equivalents (in shares)		0		0
Denominator for diluted loss per common share (in shares)		2,000		2,000
Basic and diluted earnings (loss) per common share:
Basic loss per common share		$ (4.26)		$ (6.83)
Diluted loss per common share		$ (4.26)		$ (6.83)
Excluded outstanding share-based awards having an anti-dilutive effect (in shares)		1,803		1,803
Predecessor
Numerator:
Net loss	[1]		$ (22,541)		$ (36,033)
Denominator:
Weighted average common shares outstanding (in shares)			32,310		32,306
Effect of dilutive securities:
Outstanding common stock equivalents (in shares)			0		0
Denominator for diluted loss per common share (in shares)			32,310		32,306
Basic and diluted earnings (loss) per common share:
Basic loss per common share			$ (0.70)		$ (1.12)
Diluted loss per common share			$ (0.70)		$ (1.12)
Excluded outstanding share-based awards having an anti-dilutive effect (in shares)			2,457		2,457

[1] * Adjusted due to the adoption of ASU No. 2017-07, "Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." See Note 3 - New Accounting Standards, for additional information.