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Accounts Receivable, Accounts Payable and Accrued Expenses - Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued oil and gas sales $ 26,742 $ 11,596
Joint interest billings 7,713 2,942
Hedge settlements 292 194
Other 62 2
Accounts receivable, net $ 34,809 $ 14,734