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Fair Value (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value [Abstract]  
Carrying Value And Estimated Fair Value Of Financial Instruments
     2011      2010  
     Carrying
Value
     Estimated
Fair Value
     Carrying
Value
     Estimated
Fair Value
 

Long-term debt

   $ 1,184,100       $ 1,369,763       $ 1,099,100       $ 1,139,765   

Nonrecourse long-term debt

     46,471         51,974         58,934         64,795   

Long-term debt to affiliated trusts

     51,547         43,810         51,547         37,114   
Fair Value Of Assets And Liabilities Measured On Recurring Basis
Reconciliation For All Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)