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Derivative Financial Instruments Gains and Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Gain and loss from derivative cash settlements and changes in fair value of derivative contracts        
Total Derivative Settlement Gain (Loss) [1] $ 113,695 $ (274) $ 387,719 $ (62,894)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [2] 212,253 190,661 285,491 (33,470)
Crude oil        
Gain and loss from derivative cash settlements and changes in fair value of derivative contracts        
Total Derivative Settlement Gain (Loss) 90,493 (517) 270,622 (27,435)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 131,728 140,912 138,839 15,367
Natural Gas        
Gain and loss from derivative cash settlements and changes in fair value of derivative contracts        
Total Derivative Settlement Gain (Loss) [3] 19,167 (1,687) 92,279 (28,563)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 66,538 41,352 142,807 (46,263)
Gain on Early Settlement of Derivatives     (15,300)  
Natural Gas Liquids [Member]        
Gain and loss from derivative cash settlements and changes in fair value of derivative contracts        
Total Derivative Settlement Gain (Loss) 4,035 1,930 24,818 (6,896)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 13,987 $ 8,397 $ 3,845 $ (2,574)
[1] Total derivative settlement (gain) loss is reported net of the change in accrued settlements between periods in the derivative cash settlements line item on the condensed consolidated statements of cash flows within net cash provided by operating activities.
[2] Total derivative (gain) loss is reported in the derivative (gain) loss line item on the condensed consolidated statements of cash flows within net cash provided by operating activities.
[3] Natural gas derivative settlements for the nine months ended September 30, 2015, include a $15.3 million gain recorded in the second quarter of 2015 on the early settlement of futures contracts as a result of divesting of the Company’s Mid-Continent assets.