Accounts Receivable, Accounts Payable and Accrued Expenses - Accounts Receivable (Details) - USD ($) $ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||
| Accrued oil and gas sales receivable | $ 32,294 | $ 11,596 |
| Joint interest billings | 16,989 | 2,942 |
| Hedge settlements | 126 | 194 |
| Other | 798 | 2 |
| Accounts receivable, net | $ 50,207 | $ 14,734 |