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Fresh Start Accounting - Reorganization Adjustments to Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Oct. 01, 2016	Dec. 31, 2017	Dec. 31, 2016
Reorganization Adjustments
Debtor Reorganization Adjustments, Equity [Abstract]
Par value of 18.9 million shares of Common Stock issued to former holders of the Senior Secured Notes and Unsecured Notes (valued at $29.31 per share)	$ 19
Fair value of warrants issued to holders of the Unsecured Notes	88,382
Additional paid-in capital	739,023
Total Successor Company equity issued on Emergence Date	$ 827,424
Reorganization Adjustments | Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected volatility rate	59.26%
Risk free interest rate	1.36%
Term	6 years
Reorganization Adjustments | New Common Stock
Debtor Reorganization Adjustments, Equity [Abstract]
Additional paid-in capital	$ 575,144
Reorganization Adjustments | Convertible Notes
Debtor Reorganization Adjustments, Equity [Abstract]
Additional paid-in capital	$ 163,879
Reorganization Adjustments | Series A Warrants | Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Exercise price per share	$ 41.34
Reorganization Adjustments | Series B Warrants | Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Exercise price per share	$ 42.03
Reorganization Adjustments | Convertible Debt | Convertible Notes
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Expected volatility rate	56.06%
Risk free interest rate	1.08%
Term	4 years
Recovery rate	15.00%
Hazard rate	12.41%
Drop on default (percent)	100.00%
Fair value of debt	$ 445,700
Face amount of debt instrument	$ 281,800
Successor
Debtor Reorganization Adjustments, Equity [Abstract]
Common stock, issued (in shares)		35,650	21,042
Per share value (in dollars per share)	$ 29.31
Successor | Senior Secured and Unsecured Notes Holders
Debtor Reorganization Adjustments, Equity [Abstract]
Common stock, issued (in shares)	18,900
Per share value (in dollars per share)	$ 29.31
Successor | Convertible Debt | Convertible Notes
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Fair value of debt	$ 445,700
Face amount of debt instrument	$ 281,800

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Fair Value Assumptions, Drop on Default

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Fresh-Start Adjustment, Increase (Decrease), Equity Issued

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Fresh-Start Adjustment, Increase (Decrease), Warrants and Rights Outstanding

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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