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BASIS OF PRESENTATION, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND LIQUIDITY, MANAGEMENT'S PLANS AND GOING CONCERN (Schedule of Error Corrections and Prior Period Adjustments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues $ 136,176 $ 341,746 $ 621,815 $ 1,226,658
Midstream gathering and processing expenses 110,567 135,006 334,789 382,643
Total Operating Expenses 482,576 912,701 2,004,052 1,486,146
Natural gas sales        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue $ 155,163 269,798 $ 456,859 876,411
As Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   285,175   1,064,747
Midstream gathering and processing expenses   78,435   220,732
Total Operating Expenses   856,130   1,324,235
As Reported | Natural gas sales        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue   213,227   714,500
Adjustments        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   56,571   161,911
Midstream gathering and processing expenses   56,571   161,911
Total Operating Expenses   56,571   161,911
Adjustments | Natural gas sales        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue   $ 56,571   $ 161,911