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Notes Payable (Summary Of Indebtedness) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Unsecured notes payable $ 1,538,471,000 $ 1,538,212,000
Total secured notes payable 945,134,000 972,256,000
Total notes payable 2,483,600,000 2,510,500,000
5.45% Notes Due 2013 [Member] | Senior Unsecured Notes [Member]
    
Unsecured notes payable 199,900,000 199,900,000
Notes payable, effective interest rate 5.45%  
Notes payable, maturity date 2013  
5.08% Notes Due 2015 [Member] | Senior Unsecured Notes [Member]
    
Unsecured notes payable 249,600,000 249,500,000
Notes payable, effective interest rate 5.08%  
Notes payable, maturity date 2015  
5.75% Notes Due 2017 [Member] | Senior Unsecured Notes [Member]
    
Unsecured notes payable 246,400,000 246,300,000
Notes payable, effective interest rate 5.75%  
Notes payable, maturity date 2017  
4.70% Notes Due 2021 [Member] | Senior Unsecured Notes [Member]
    
Unsecured notes payable 248,700,000 248,700,000
Notes payable, effective interest rate 4.70%  
Notes payable, maturity date 2021  
3.07% Notes Due 2022 [Member] | Senior Unsecured Notes [Member]
    
Unsecured notes payable 346,400,000 346,300,000
Notes payable, effective interest rate 3.07%  
Notes payable, maturity date 2022  
5.00% Notes Due 2023 [Member] | Senior Unsecured Notes [Member]
    
Unsecured notes payable 247,500,000 247,500,000
Notes payable, effective interest rate 5.00%  
Notes payable, maturity date 2023  
Secured Notes Zero Point Eight Nine Percentage To Six Point Zero Zero Percentage Conventional Mortgage Notes Due Two Thousand Twelve Till Two Thousand Forty Five Member | Secured Debt [Member]
    
Total secured notes payable 907,700,000 934,600,000
Tax-Exempt Mortgage Note Due 2028 (1.35% floating rate) | Secured Debt [Member]
    
Total secured notes payable 37,400,000 37,700,000
Notes payable, effective interest rate 1.35%  
Notes payable, maturity date 2028  
Floating Rate Debt Included In Secured Notes (1.02%) | Secured Debt [Member]
    
Total secured notes payable $ 175,000,000 $ 175,000,000
Minimum [Member] | 1.02% - 6.00% Conventional Mortgage Notes, Due 2014 - 2045 | Secured Debt [Member]
    
Notes payable, effective interest rate 1.02%  
Notes payable, maturity date 2014  
Minimum [Member] | Floating Rate Debt Included In Secured Notes (1.02%) | Secured Debt [Member]
    
Notes payable, effective interest rate 1.02%  
Maximum [Member] | 1.02% - 6.00% Conventional Mortgage Notes, Due 2014 - 2045 | Secured Debt [Member]
    
Notes payable, effective interest rate 6.00%  
Notes payable, maturity date 2045