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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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