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Basis Of Presentation And Summary Of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2011
Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract] 
Material Differences Between The Carrying Amounts And The Estimated Fair Values Of Financial Instruments
                                 
     September 30, 2011     December 31, 2010  
     Carrying
Amount
    Fair Value     Carrying
Amount
    Fair Value  

Investment in direct financing lease

   $ 11,161      $ 13,089      $ 12,185      $ 14,439   

Note receivable from APM

   $ 4,867      $ 8,153      $ 4,880      $ 7,970   

Debt

   $ (1,209,652   $ (1,252,025   $ (1,156,568   $ (1,206,347