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ADDITIONAL FINANCIAL STATEMENT INFORMATION (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts receivable:    
Oil, natural gas and natural gas liquids revenues $ 37,085 $ 24,110
Joint interest accounts 8,736 2,249
Other 943 10,057
Total 46,764 36,416
Prepaids and other:    
Prepaids 4,684 4,324
Income tax receivable 6,250 6,250
Other 35 54
Total 10,969 10,628
Funds in escrow and other:    
Funds in escrow 568 563
Other 1,347 1,128
Total 1,915 1,691
Accounts payable and accrued liabilities:    
Trade payables 51,192 35,688
Accrued oil and natural gas capital costs 53,692 50,743
Revenues and royalties payable 20,587 20,256
Accrued interest expense 5,858 10,985
Accrued employee compensation 5,086 9,805
Accrued lease operating expenses 4,667 2,024
Other 295 1,586
Total $ 141,377 $ 131,087