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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accounts payable and other accrued expenses $ 54,957 $ 75,191
Accrued interest 65 1,385
Revenues and royalties payable 42,075 37,274
Payroll and benefits 15,719 21,475
Drilling advances 164 3,830
Total accounts payable and accrued expenses $ 112,980 $ 139,155