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
Mar. 31, 2014
Mar. 31, 2013
Revenue
   
Summary of realized and unrealized gains (losses) on derivative instruments    
Commodity derivative fair value losses $ (248,929) $ (71,941)