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Derivative Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Derivative Financial Instruments  
Components of gain (loss) on derivatives, net

 

 
  Three Months Ended
March 31,
 
 
  2012   2011  

Realized gain (loss) on other derivative agreements

  $ (19,086 ) $ (18,848 )

Unrealized gain (loss) on other derivative agreements

    (128,167 )   (3,258 )
           

Total gain (loss) on derivatives, net

  $ (147,253 ) $ (22,106 )