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Fair Value Measurements (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $)
 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Term Loan [Member]
Jul. 31, 2011
Construction Loan [Member]
Dec. 31, 2010
Construction Loan [Member]
Dec. 31, 2011
Fixed Rate Notes Payable [Member]
Dec. 31, 2010
Fixed Rate Notes Payable [Member]
Dec. 31, 2011
Floating Rate Notes Payable [Member]
Dec. 31, 2010
Floating Rate Notes Payable [Member]
Jun. 30, 2011
Commercial Banks [Member]
Term Loan, Due 2012 [Member]
Fair Value Of Notes Receivable And Notes Payable [Line Items]                    
Notes receivable - affiliates, Carrying Value    $ 3,194,000                
Notes receivable - affiliates, Estimated Fair Value    3,200,000                
Carrying Value 2,432,100,000 2,563,800,000       2,186,600,000 [1] 2,333,500,000 [1] 245,500,000 230,300,000  
Estimated Fair Value           2,304,400,000 [1] 2,386,000,000 [1] 233,600,000 212,700,000  
Fixed rate notes payable     500,000,000   16,600,000          
Construction loan extension date       July 2011            
Repayment of senior unsecured notes $ 500,000,000                 $ 500,000,000
[1] December 31, 2010 includes a $500 million term loan entered into in 2007, and a $16.6 million construction loan entered into in 2008 which are effectively fixed by the use of interest rate swaps but evaluated for estimated fair value at the floating rate. The $500 million term loan was repaid in June 2011. The $16.6 million construction loan interest rate swap matured and was not extended in conjunction with the one-year extension of the loan in July 2011.