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ADDITIONAL FINANCIAL STATEMENT INFORMATION (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts receivable:    
Oil, natural gas and natural gas liquids revenues $ 29,406 $ 24,110
Joint interest accounts 1,935 2,249
Other 5,541 10,057
Total 36,882 36,416
Prepaids and other:    
Prepaids 5,961 4,324
Income tax receivable 6,250 6,250
Other 29 54
Total 12,240 10,628
Funds in escrow and other:    
Funds in escrow 566 563
Other 1,397 1,128
Total 1,963 1,691
Accounts payable and accrued liabilities:    
Trade payables 29,656 35,688
Accrued oil and natural gas capital costs 63,764 50,743
Revenues and royalties payable 17,353 20,256
Accrued interest expense 16,147 10,985
Accrued employee compensation 4,247 9,805
Accrued lease operating expenses 3,746 2,024
Deferred premium on derivative contracts 576 1,142
Other 52 444
Total $ 135,541 $ 131,087