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Derivative Activities (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Derivative Fair Value Income        
Change in fair value of derivatives that do not qualify for hedge accounting $ 135,777 $ 48,139 $ 83,721 $ 8,103
Realized gain (loss) on settlement - natural gas   3,484   3,090
Realized gain (loss) on settlement - oil 768 (6,094) (3,854) (8,012)
Realized gain (loss) on settlement - NGLs 10,152   5,760  
Hedge ineffectiveness - realized 1,278 1,576 2,463 2,522
Hedge ineffectiveness - unrealized 594 5,934 (354) 6,502
Derivative fair value income $ 148,569 $ 53,039 $ 87,736 $ 12,205