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Derivative Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Derivative Financial Instruments  
Components of gain (loss) on derivatives, net

 

 

 
  Three Months Ended June 30,   Six Months Ended June 30,  
 
  2012   2011   2012   2011  

Realized gain (loss) on other derivative agreements

  $ (8,069 ) $ 484   $ (27,155 ) $ (18,364 )

Unrealized gain (loss) on other derivative agreements

    46,886     6,448     (81,281 )   3,190  
                   

Total gain (loss) on derivatives, net

  $ 38,817   $ 6,932   $ (108,436 ) $ (15,174 )