Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

v3.20.4
Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
bbl
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Decrease in capital spending, percentage 50.00%    
Accounts receivable, collection period 30 days    
Allowance for doubtful accounts $ 0 $ 0  
Impairment of oil and natural gas properties $ 1,357,099,000 2,039,770,000 $ 0
Conversion ratio, gas to barrels of oil (in Mcf of gas) | bbl 6    
Capitalized costs of oil and natural gas properties excluded from amortization $ 1,457,043,000 1,686,666,000  
Unrecognized tax benefits that would impact effective tax rate 0    
Equity method investment recognized impairment charges     0
Unsecured Debt      
Summary Of Significant Accounting Policies [Line Items]      
Debt instrument, repurchase amount 73,300,000    
Investment in Mammoth Energy Services, Inc.      
Summary Of Significant Accounting Policies [Line Items]      
Equity method investment recognized impairment charges 0 160,800,000  
Investment in Grizzly Oil Sands ULC      
Summary Of Significant Accounting Policies [Line Items]      
Equity method investment recognized impairment charges $ 0 $ 32,400,000 $ 0
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Useful life 3 years    
Minimum | Restricted stock      
Summary Of Significant Accounting Policies [Line Items]      
Vesting period 1 year    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Useful life 30 years    
Maximum | Restricted stock      
Summary Of Significant Accounting Policies [Line Items]      
Vesting period 3 years