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Fair Value Disclosures (Fair Value of Notes Receivable and Notes Payable) (Details) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Notes receivable - affiliates, carrying vlaue   $ 3,194,000
Notes receivable - affiliates, estimated fair value   3,200,000
Carrying Value 2,434,100,000 2,563,800,000
Term Loan [Member]
   
Fixed rate notes payable   500,000,000
Construction Loan [Member]
   
Fixed rate notes payable 16,600,000  
Fixed rate notes payable [Member]
   
Carrying Value 2,204,500,000 2,333,500,000
Estimated Fair Value 2,282,600,000 2,386,000,000
Floating rate notes payable [Member]
   
Carrying Value 229,600,000 230,300,000
Estimated Fair Value $ 216,000,000 $ 212,700,000