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Notes Payable (Summary Of Indebtedness) (Details) (USD $)
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Unsecured notes payable $ 1,579,733,000 $ 1,538,212,000
Total secured notes payable 944,090,000 972,256,000
Total notes payable 2,523,800,000 2,510,500,000
Senior Unsecured Notes [Member]
    
Unsecured notes payable 1,538,700,000 1,538,200,000
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 246,300,000 246,300,000
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 248,800,000 248,700,000
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 346,500,000 346,300,000
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 247,600,000 247,500,000
Notes payable, effective interest rate 5.00%  
Notes payable, maturity date 2023  
1.00% - 6.00% Conventional Mortgage Notes, Due 2014 - 2045 | Secured Debt [Member]
    
Total secured notes payable 907,100,000 934,600,000
Tax-Exempt Mortgage Note Due 2028 (1.29% floating rate) | Secured Debt [Member]
    
Total secured notes payable 37,000,000 37,700,000
Notes payable, effective interest rate 1.29%  
Notes payable, maturity date 2028  
Floating Rate Debt Included In Secured Notes (1.00%) | Secured Debt [Member]
    
Total secured notes payable 175,000,000 175,000,000
Minimum [Member] | 1.00% - 6.00% Conventional Mortgage Notes, Due 2014 - 2045 | Secured Debt [Member]
    
Notes payable, effective interest rate 1.00%  
Notes payable, maturity date 2014  
Minimum [Member] | Floating Rate Debt Included In Secured Notes (1.00%) | Secured Debt [Member]
    
Notes payable, effective interest rate 1.00%  
Maximum [Member] | 1.00% - 6.00% Conventional Mortgage Notes, Due 2014 - 2045 | Secured Debt [Member]
    
Notes payable, effective interest rate 6.00%  
Notes payable, maturity date 2045  
Line of Credit [Member] | Commercial Banks [Member]
    
Unsecured notes payable $ 41,000,000 $ 0