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BASIS OF PRESENTATION AND LIQUIDITY, MANAGEMENT'S PLANS AND GOING CONCERN (Schedule of Error Corrections and Prior Period Adjustments) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total Revenues $ 247,358 $ 299,338
Transportation, gathering, processing and compression 105,867 110,357
Total Operating Expenses 196,501 779,425
Natural gas sales    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Revenue $ 235,321 161,008
As Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total Revenues   246,877
Transportation, gathering, processing and compression   57,896
Total Operating Expenses   726,964
As Reported | Natural gas sales    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Revenue   108,547
Adjustments    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total Revenues   52,461
Transportation, gathering, processing and compression   52,461
Total Operating Expenses   52,461
Adjustments | Natural gas sales    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Revenue   $ 52,461