Quarterly report pursuant to Section 13 or 15(d)

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)

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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