Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Risk Management Activities (Details 4)

v2.4.0.8
Derivative Instruments and Risk Management Activities (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Summary of realized and unrealized gains (losses) on derivative instruments        
Total gains (losses) on commodity contracts $ 161,968 $ (177,884) $ 285,510 $ 98,568
Revenue
       
Summary of realized and unrealized gains (losses) on derivative instruments        
Commodity derivative fair value gains (losses) 161,968 (159,004) 285,510 52,210
Discontinued operations
       
Summary of realized and unrealized gains (losses) on derivative instruments        
Commodity derivative fair value gains (losses)   $ (18,880)   $ 46,358