Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

v3.6.0.2
Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
Mcf / bbl
purchaser
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Accounts receivable, collection period 30 days      
Allowance for doubtful accounts $ 0 $ 0    
Impairment of oil and gas properties $ 715,495,000 1,440,418,000 $ 0  
Conversion ratio, gas to barrels of oil | Mcf / bbl 6      
Capitalized costs of oil and natural gas properties excluded from amortization $ 1,580,305,000 1,817,701,000   $ 575,521,000
Unrecognized tax benefits that would impact effective tax rate 0      
Interest and penalties associated with uncertain tax positions 0      
Oil and gas reclamation liability, noncurrent $ 0 $ 0    
Investment owned, balance (in shares) | shares   0    
Investment in Diamondback Energy, Inc.        
Summary Of Significant Accounting Policies [Line Items]        
Investment owned, balance (in shares) | shares 0      
Investment in Grizzly Oil Sands ULC        
Summary Of Significant Accounting Policies [Line Items]        
Equity method investment recognized impairment charges $ 23,100,000 $ 101,600,000    
Investment in Tatex Thailand III, LLC        
Summary Of Significant Accounting Policies [Line Items]        
Equity method investment recognized impairment charges     $ 12,100,000  
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Useful life 3 years      
Minimum | Restricted stock        
Summary Of Significant Accounting Policies [Line Items]        
Vesting period 2 years      
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Useful life 30 years      
Maximum | Restricted stock        
Summary Of Significant Accounting Policies [Line Items]        
Vesting period 5 years      
Customer concentration risk | Accounts receivable        
Summary Of Significant Accounting Policies [Line Items]        
Concentration risk, number of purchasers | purchaser 3