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Derivative Commodity Instruments - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
counterparty
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
counterparty
Sep. 30, 2014
USD ($)
Derivative [Line Items]        
Number of Active Counterparties with Whom Company Holds Net Gain Positions | counterparty 12   12  
Number of Active Counterparties with Whom Company Holds Net Loss Positions | counterparty 2   2  
Gain (Loss) on fair value of derivatives $ 107,173 $ 147,735 $ 90,245 $ 9,498
Commodity contracts        
Derivative [Line Items]        
Gain (Loss) on fair value of derivatives $ 107,173 $ 147,735 90,245 $ 9,498
Commodity contracts | J.P Morgan Ventures Energy Corporation        
Derivative [Line Items]        
Gain (Loss) on fair value of derivatives     22,600  
Commodity contracts | Merrill Lynch Commodities, Inc.        
Derivative [Line Items]        
Gain (Loss) on fair value of derivatives     20,500  
Commodity contracts | Canadian Imperial Bank of Commerce        
Derivative [Line Items]        
Gain (Loss) on fair value of derivatives     14,000  
Commodity contracts | Morgan Stanley Capital Group Inc        
Derivative [Line Items]        
Gain (Loss) on fair value of derivatives     24,100  
Commodity contracts | BP Corporation North America, Inc        
Derivative [Line Items]        
Gain (Loss) on fair value of derivatives     $ 13,900