Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details 4)

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Derivative Instruments (Details 4) (Revenue, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue
       
Summary of realized and unrealized gains (losses) on derivative instruments        
Commodity derivative fair value gains (losses) $ (123,766) $ 195,483 $ (372,695) $ 123,542