Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT (Summary of Non-producing Properties Excluded from Amortization by Area) (Details)

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PROPERTY AND EQUIPMENT (Summary of Non-producing Properties Excluded from Amortization by Area) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization $ 1,564,189 $ 1,686,666
Utica    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization 874,886  
MidContinent    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization 687,169  
Other    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization $ 2,134