Fresh Start Accounting - Reconciliation of Enterprise Value to Fair Value (Details) - Successor - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Oct. 01, 2016
Reconciliation of Enterprise Value to Fair Value
Enterprise value			$ 1,089,808
Cash and cash equivalents	$ 99,143	$ 121,231	563,372
Less: Fair value of Building Note			(36,610)
Less: Asset retirement obligation			(92,412)
Less: Fair value of First Lien Exit Facility			(414,954)
Less: Fair value of Convertible Notes			(445,660)
Less: Fair value of warrants, including warrants held in reserve for settlement of general unsecured claims			(95,794)
Fair value of Successor common stock issued upon emergence			$ 567,750
Shares issued upon emergence on October 4, 2016, including shares held in reserve for settlement of general unsecured claims	35,650	19,635	19,371
Per share value (in dollars per share)			$ 29.31

Asset Retirement Obligations, Fair Value Disclosure

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Common Stock, Value, Fair Value Disclosure

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Enterprise Value

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[Line Items] for Reconciliation of Enterprise Value to Fair Value [Table]

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

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Fair value portion of notes payable.

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Per share or per unit amount of equity securities issued.

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Fair value portion of warrants not settleable in cash classified as equity.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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