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Long-Term Debt - Narrative (Details) - USD ($) shares in Millions			1 Months Ended		3 Months Ended	7 Months Ended		12 Months Ended
	Feb. 10, 2017	Oct. 01, 2016	Feb. 28, 2017	Feb. 09, 2017	Dec. 31, 2016	May 11, 2017	May 11, 2017	Dec. 31, 2018	Dec. 31, 2017	Oct. 31, 2018
Debt Instrument [Line Items]
Face value of long-term debt								$ 0	$ 37,502,000
Secured Notes | Building Note
Debt Instrument [Line Items]
Face value of long-term debt								0	37,502,000
Face amount of debt instrument		$ 35,000,000.0
Fair value of debt		36,600,000
Term of paid in kind interest payments							90 days
Proceeds from issuance of debt		$ 26,800,000
Paid-in-kind interest						$ 1,300,000
Gain on extinguishment of debt								1,200,000
Secured Notes | Building Note | October 5, 2016 through October 4, 2017
Debt Instrument [Line Items]
Annual interest rate		6.00%
Secured Notes | Building Note | October 5, 2017 through October 4, 2018
Debt Instrument [Line Items]
Annual interest rate		8.00%
Secured Notes | Building Note | October 5, 2018 and thereafter
Debt Instrument [Line Items]
Annual interest rate		10.00%
Convertible Debt | New Convertible Notes
Debt Instrument [Line Items]
Face amount of debt instrument		$ 281,800,000
Fair value of debt		445,700,000
Premium on debt instrument		$ 163,900,000
Conversion ratio		0.05330841
Common stock issued for debt				$ 5,100,000	$ 13,000,000.0
Common stock issued for debt (in shares)	14.1	15.0		0.3	0.7
Debt conversion, original debt, amount	$ 263,700,000
Revolving Credit Facility | New First Lien Exit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 425,000,000.0
Cash collateral account	$ 50,000,000.0
Revolving Credit Facility | New First Lien Exit Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		3.75%
Revolving Credit Facility | New First Lien Exit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		4.75%
Variable rate floor		1.00%
Revolving Credit Facility | New First Lien Exit Facility and New Amended Credit Facility
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.50%
Revolving Credit Facility | Amended New Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 600,000,000.0
Line of credit facility, current borrowing capacity	$ 425,000,000.0									$ 350,000,000.0
Minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination	95.00%
Ratio of Indebtedness to Assets	3.50
Minimum consolidated interest coverage ratio	2.25
Aggregate amount of default trigger	$ 25,000,000.0
Legal judgment default trigger	$ 25,000,000.0
Face value of long-term debt								0	0
Letters of credit outstanding								5,200,000
Revolving Credit Facility | Amended New Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Revolving Credit Facility | Amended New Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Revolving Credit Facility | Amended New Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Revolving Credit Facility | Amended New Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.00%
Successor
Debt Instrument [Line Items]
Common stock issued for debt					$ 13,001,000			0	268,779,000
Gain on extinguishment of debt					$ 0			$ 1,151,000	$ 0
Successor | Convertible Debt | New Convertible Notes
Debt Instrument [Line Items]
Common stock issued for debt (in shares)			14.1

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