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Debt - TPG Term Loan - Amendments (Details) - Term Loan - TPG Term Loan - USD ($) |  |  |  |  | 1 Months Ended | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 06, 2017 | Dec. 19, 2016 | Aug. 22, 2016 | Jun. 28, 2016 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2018 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Reserve against borrowing base availability |  | $ 12,500,000 | $ 12,500,000 |  |  |  |  |
Reserve against borrowing base after Form 10-Q is filed |  |  | 7,500,000 |  |  |  |  |
Amendment fee |  |  | $ 3,000,000 |  | $ 6,100,000 | $ 5,100,000 |  | $ 11,400,000
Prepayment right notice period |  | 10 days |  |  |  |  |  |
Waiver fee amount |  | $ 2,300,000 |  |  |  |  |  |
Legal fees |  | $ 400,000 |  |  |  |  |  |
Debt default, basis spread on interest rate | 2.00% |  |  | 2.00% |  |  |  |
Principal amount of loan with amendment fees | $ 71,400,000 |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 60,000,000.0 |  |  |  |
Forecast |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amendment fee |  |  |  |  |  |  | $ 8,400,000 |

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