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Long-Term Debt - Additional Information (Details) - USD ($)			3 Months Ended		7 Months Ended	9 Months Ended
	Feb. 10, 2017	Oct. 04, 2016	Sep. 30, 2018	Sep. 30, 2017	May 11, 2017	Sep. 30, 2018	Sep. 30, 2017	Oct. 03, 2019	Oct. 31, 2018	Oct. 03, 2018	Dec. 31, 2017	Oct. 03, 2017
Debt Instrument
Gain on extinguishment of debt			$ 0	$ 0		$ 1,151,000	$ 0
Revolving Credit Facility | First Lien Exit Facility
Debt Instrument
Maximum borrowing capacity		$ 425,000,000.0
Cash collateral released	$ 50,000,000.0
Revolving Credit Facility | Credit Facility
Debt Instrument
Maximum borrowing capacity	600,000,000.0
Borrowing base	$ 425,000,000.0
Commitment fee	0.50%
Percentage of proved reserves pledged as collateral	95.00%
Total net leverage ratio (no greater than)	3.50
Interest coverage ratio (no less than)	2.25
Aggregate principal amount of default trigger	$ 25,000,000.0
Default trigger related to judgment liability	$ 25,000,000.0
Debt outstanding			0			0
Outstanding letters of credit			6,200,000			6,200,000
Revolving Credit Facility | Credit Facility | Base Rate | Minimum
Debt Instrument
Basis spread on variable rate	2.00%
Revolving Credit Facility | Credit Facility | Base Rate | Maximum
Debt Instrument
Basis spread on variable rate	3.00%
Revolving Credit Facility | Credit Facility | LIBOR | Minimum
Debt Instrument
Basis spread on variable rate	3.00%
Revolving Credit Facility | Credit Facility | LIBOR | Maximum
Debt Instrument
Basis spread on variable rate	4.00%
Secured Notes | New Building Note
Debt Instrument
Debt outstanding			$ 0			0					$ 37,502,000
Face amount of debt instrument	$ 35,000,000.0	35,000,000.0
Annual interest rate												6.00%
Interest paid-in-kind term					90 days
Interest costs paid-in-kind					$ 1,300,000
Fair Value		36,600,000
Gain on extinguishment of debt						$ 1,200,000
Unsecured Debt | Pre-bankruptcy Unsecured Debt
Debt Instrument
Proceeds remitted to unsecured creditors		$ 26,800,000
Forecast | Secured Notes | New Building Note
Debt Instrument
Annual interest rate								10.00%		8.00%
Subsequent Event | Revolving Credit Facility | Credit Facility
Debt Instrument
Borrowing base									$ 350,000,000.0

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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