Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Mcf / bbl
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Net cash provided by operating activities $ 723,993,000 $ 786,271,000 $ 679,889,000
Impairment of oil and natural gas properties $ 2,039,770,000 0 0
Accounts receivable, collection period 30 days    
Allowance for doubtful accounts $ 0 0  
Conversion ratio, gas to barrels of oil (in Mcf of gas) | Mcf / bbl 6    
Capitalized costs of oil and natural gas properties excluded from amortization $ 1,686,666,000 2,873,037,000  
Unrecognized tax benefits $ 0    
Equity method investment recognized impairment charges   0  
Restricted stock      
Summary Of Significant Accounting Policies [Line Items]      
Vesting period 3 years    
Investment in Mammoth Energy Services, Inc.      
Summary Of Significant Accounting Policies [Line Items]      
Equity method investment recognized impairment charges $ 160,800,000   0
Investment in Grizzly Oil Sands ULC      
Summary Of Significant Accounting Policies [Line Items]      
Equity method investment recognized impairment charges $ 32,400,000 $ 0 $ 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 4 years    
Misclassification between Operation and Financing Activities      
Summary Of Significant Accounting Policies [Line Items]      
Net cash provided by operating activities $ 33,800,000