Basis of Presentation and Significant Accounting Policies - Basic and Diluted Earnings Per Share Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Numerator:
(Loss) income from continuing operations	$ (13,327)
Income from discontinued operations, net of income taxes	0
Net (loss) income	$ (13,327)
Denominator:
Weighted average common shares outstanding	2,000
Effect of dilutive securities:
Outstanding common stock equivalents (in shares)	0
Denominator for diluted (loss) earnings per share (in shares)	2,000
Basic (loss) earnings per common share:
Continuing operations (in dollars per share)	$ (6.66)
Discontinued operations (in dollars per share)	0.00
Net basic (loss) earnings per common share (in dollars per share)	(6.66)
Diluted (loss) earnings per common share:
Continuing operations (in dollars per share)	(6.66)
Discontinued operations (in dollars per share)	0.00
Net diluted (loss) earnings per common share (in dollars per share)	$ (6.66)
Anti-dilutive securities excluded from calculation (in shares)	1,734
Convertible Debt Securities | 5.25% Convertible Notes due December 30, 2019
Diluted (loss) earnings per common share:
Anti-dilutive securities excluded from calculation (in shares)	0
Convertible Debt Securities | Second Lien Notes
Diluted (loss) earnings per common share:
Anti-dilutive securities excluded from calculation (in shares)	0
Predecessor
Numerator:
(Loss) income from continuing operations		$ 36,190	$ (114,090)
Income from discontinued operations, net of income taxes		0	6,108
Net (loss) income		$ 36,190	$ (107,982)
Denominator:
Weighted average common shares outstanding		32,174	29,009
Effect of dilutive securities:
Outstanding common stock equivalents (in shares)		0	0
Denominator for diluted (loss) earnings per share (in shares)		32,174	29,009
Basic (loss) earnings per common share:
Continuing operations (in dollars per share)		$ 1.12	$ (3.93)
Discontinued operations (in dollars per share)		0.00	0.21
Net basic (loss) earnings per common share (in dollars per share)		1.12	(3.72)
Diluted (loss) earnings per common share:
Continuing operations (in dollars per share)		1.12	(3.93)
Discontinued operations (in dollars per share)		0.00	0.21
Net diluted (loss) earnings per common share (in dollars per share)		$ 1.12	$ (3.72)
Anti-dilutive securities excluded from calculation (in shares)		0	2,640
Predecessor | Convertible Debt Securities | 5.25% Convertible Notes due December 30, 2019
Diluted (loss) earnings per common share:
Anti-dilutive securities excluded from calculation (in shares)		0	0
Predecessor | Convertible Debt Securities | Second Lien Notes
Diluted (loss) earnings per common share:
Anti-dilutive securities excluded from calculation (in shares)		0	0