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Long-Term Debt Term Loan Credit Facility (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 08, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jul. 22, 2016
USD ($)
$ / shares
shares
Debt Instrument [Line Items]          
Fair value of common stock warrants   $ 246,743 $ 0    
Loss on change in fair value of common stock warrants   229,980 0 $ 0  
Term Loan Credit Facility          
Debt Instrument [Line Items]          
Principal amount of term loan $ 350,000        
Unamortized original issue discount 16,800 14,961 $ 0    
Proceeds from line of credit 340,000        
Fair value of common stock warrants $ 16,800 $ 246,700      
Interest rate, stated percentage 12.50%        
Interest rate, stated percentage, in-kind 15.00%        
Common stock, shares subscribed but unissued (in shares) | shares         5,051,100
Cash proceeds of common stock         $ 150,000
Common stock price per share (in dollars per share) | $ / shares         $ 29.70
Revolving Credit Facility          
Debt Instrument [Line Items]          
Outstanding balance repaid, plus interest and fees $ 160,000        
Minimum | Term Loan Credit Facility          
Debt Instrument [Line Items]          
Percentage of adjusted engineered value of oil and gas interests serving as collateral 90.00%        
Asset to secured debt coverage ratio 1.2        
Minimum | Revolving Credit Facility          
Debt Instrument [Line Items]          
Percentage of adjusted engineered value of oil and gas interests serving as collateral 90.00%        
Common Stock          
Debt Instrument [Line Items]          
Warrants issued (in shares) | shares 2,251,364        
Exercise price of warrant (in dollars per share) | $ / shares $ 22.00