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, 2019
Dec. 31, 2018
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization $ 2,836,441 $ 2,873,037
Utica    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization 1,475,997  
MidContinent    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization 1,359,279  
Niobrara    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization 454  
Southern Louisiana    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization 611  
Bakken    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total non-producing properties not subject to amortization $ 100