Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT (Narrative) (Details)

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PROPERTY AND EQUIPMENT (Narrative) (Details)
 3 Months Ended 9 Months Ended
Jul. 03, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
usd_per_mcf
Sep. 30, 2018
USD ($)
usd_per_mcf
Dec. 31, 2018
USD ($)
Property, Plant and Equipment [Line Items]            
Impairment of oil and natural gas properties   $ 571,442,000 $ 0 $ 571,442,000 $ 0  
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool   229,600,000   229,600,000    
Capitalized general and administrative costs   9,800,000 $ 10,600,000 $ 26,300,000 $ 28,800,000  
Depletion per Mcfe of gas equivalent (usd per Mcfe) | usd_per_mcf       1.05 0.94  
Non-producing leasehold costs   $ 2,260,759,000   $ 2,260,759,000   $ 2,873,037,000
Non-producing leases, extension term   5 years   5 years    
Payments to acquire businesses $ 9,200,000          
Disposal group, including discontinued operation, contingent payment period 2 years          
Asset retirement obligation, liabilities removed due to divestitures       $ 30,000,000.0    
Minimum            
Property, Plant and Equipment [Line Items]            
Expected number of years amortization will commence       3 years    
Maximum            
Property, Plant and Equipment [Line Items]            
Expected number of years amortization will commence       5 years    
Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Property, Plant and Equipment [Line Items]            
Total consideration $ 19,700,000