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
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total non-producing properties not subject to amortization $ 1,413,774 $ 1,457,043
Utica    
Property, Plant and Equipment [Line Items]    
Total non-producing properties not subject to amortization 761,397  
SCOOP    
Property, Plant and Equipment [Line Items]    
Total non-producing properties not subject to amortization 651,451  
Other    
Property, Plant and Equipment [Line Items]    
Total non-producing properties not subject to amortization $ 926