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Fair Value Disclosures (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Carrying Value $ 2,700,200,000 $ 2,530,800,000  
Balances outstanding under our unsecured notes line of credit and short-term borrowings 1,769,287,000 1,588,798,000  
Fixed rate notes payable
      
Carrying Value 2,309,700,000 2,319,500,000  
Estimated Fair Value 2,463,600,000 2,391,500,000  
Floating rate notes payable (1)
      
Carrying Value 390,500,000 211,300,000 253,000,000
Estimated Fair Value 384,200,000 201,400,000  
Line of Credit [Member] | Commercial Banks [Member]
      
Balances outstanding under our unsecured notes line of credit and short-term borrowings $ 180,000,000 $ 0