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Fair Value Disclosures (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Carrying Value $ 2,743,900,000 $ 2,530,800,000  
Balances outstanding under our unsecured notes line of credit and short-term borrowings 1,837,621,000 1,588,798,000  
Fixed rate notes payable
      
Carrying Value 2,533,800,000 2,319,500,000  
Estimated Fair Value 2,661,400,000 2,391,500,000  
Floating rate notes payable
      
Carrying Value 210,100,000 211,300,000 394,600,000
Estimated Fair Value $ 203,500,000 $ 201,400,000