Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Detail 4)

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Derivative Instruments (Detail 4) (Revenue, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Mar. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenue
       
Summary of realized and unrealized gains (losses) on derivative instruments        
Commodity derivative fair value gains $ 308,975 $ 161,968 $ (63,720) $ 285,510