Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Narrative (Details)

v3.19.3.a.u2
Property and Equipment - Narrative (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
usd_per_mcf
Dec. 31, 2018
USD ($)
usd_per_mcf
Dec. 31, 2017
USD ($)
usd_per_mcf
Property, Plant and Equipment [Line Items]      
Impairment of oil and natural gas properties $ 2,039,770,000 $ 0 $ 0
Interest capitalized 3,372,000 4,470,000 9,470,000
Interest cost capitalized, acquisition and development activities $ 30,100,000 $ 37,700,000 $ 35,700,000
Depletion per Mcf of gas equivalent (usd per Mcfe) | usd_per_mcf 1.08 0.96 0.90
Capitalized costs of oil and natural gas properties excluded from amortization $ 1,686,666,000 $ 2,873,037,000  
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