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OPERATING REVENUES - Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Disaggregation of operating revenue      
Total oil, natural gas and natural gas liquids sales $ 51,923 $ 49,100  
Other (7) 155  
Total operating revenues 51,916 49,255  
Oil      
Disaggregation of operating revenue      
Total oil, natural gas and natural gas liquids sales 45,517 43,069  
Natural gas      
Disaggregation of operating revenue      
Total oil, natural gas and natural gas liquids sales 1,461 2,319  
Natural gas liquids      
Disaggregation of operating revenue      
Total oil, natural gas and natural gas liquids sales 4,945 $ 3,712  
Accounts receivable      
Disaggregation of operating revenue      
Due from contracts with customers $ 30,700   $ 26,400