Accounts Receivable, Accounts Payable and Accrued Expenses - Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Oil and natural gas sales	$ 19,341	$ 11,596
Joint interest billings	2,692	2,942
Hedge settlements	128	194
Other	5	2
Accounts receivable, net	23,322	14,734
Silverback Exploration, LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other	$ 1,156	$ 0