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Derivative Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Derivative Financial Instruments [Abstract]  
Effect of derivative instruments on the statement of operations
                                     
    Amount of Loss Recognized in OCI
on Derivative (Effective Portion)
        Amount Reclassified from
Accumulated OCI into Income
 

Derivatives in

Cash Flow

Hedging

Relationships

  Three Months
Ended March 31,
2012
    Three Months
Ended March 31,
2011
   

Location of Amount Reclassified from
Accumulated OCI into Income

  Three Months
Ended March 31,
2012
    Three Months
Ended March 31,
2011
 

Interest rate swaps

  $ —       $ (286   Interest expense, net of amounts capitalized   $ —       $ 5,453  

Natural gas swaps

    —         (94   Operating Costs     —         157  
   

 

 

   

 

 

       

 

 

   

 

 

 

Total

  $ —       $ (380   Total   $ —       $ 5,610