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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2011
Basis of Presentation and Summary of Significant Accounting Policies  
Schedule of Material Difference between the Carrying Amounts and the Estimated Fair Values of Financial Instruments
     June 30, 2011     December 31, 2010  
     Carrying
Amount
    Fair Value     Carrying
Amount
    Fair Value  

Investment in direct financing lease

   $ 11,513      $ 13,441      $ 12,185      $ 14,439   

Note receivable from APM

   $ 5,053      $ 8,113      $ 4,880      $ 7,970   

Debt

   $ (1,104,294   $ (1,166,150   $ (1,156,568   $ (1,206,347