Emergence from Chapter 11 and Fresh Start Accounting - Reconciliation of Enterprise Value to Estimated Reorganization Value (Details) - Successor $ in Thousands	Dec. 31, 2016 USD ($)
Fresh-Start Adjustment [Line Items]
Enterprise Value	$ 525,000
Plus: Cash and cash equivalents and restricted cash	101,304
Plus: Other non-operating assets	11,324
Fair value of invested capital	637,628
Plus: Current liabilities, excluding current portion of long-term debt	101,353
Plus: Non-current liabilities	29,179
Reorganization Value of Successor Assets	$ 768,160

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Amount of other noncurrent assets at the balance sheet date after fresh-start adjustments.

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Amount attributed to the reconstituted entity, as well as the expected net realizable value of those assets that will be disposed before reconstitution occurs.

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