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Notes Payable (Summary Of Indebtedness) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Unsecured Debt $ 1,588,798,000 $ 1,538,212,000
Total secured notes payable 941,968,000 972,256,000
Total notes payable 2,530,800,000 2,510,500,000
Notes payable, effective interest rate 4.27%  
Value Of Real Estate Assets At Cost Subject To Secured Notes 1,582,500,000 1,584,700,000
5.45% Notes Due 2013 [Member] | Senior Unsecured Notes [Member]
    
Unsecured Debt 0 199,900,000
Notes payable, effective interest rate 5.45%  
Notes payable, maturity date 2013  
5.08% Notes Due 2015 [Member] | Senior Unsecured Notes [Member]
    
Unsecured Debt 249,700,000 249,500,000
Notes payable, effective interest rate 5.08%  
Notes payable, maturity date 2015  
5.75% Notes Due 2017 [Member] | Senior Unsecured Notes [Member]
    
Unsecured Debt 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 Debt 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 Debt 346,700,000 346,300,000
Notes payable, effective interest rate 3.07%  
Notes payable, maturity date 2022  
5.00% Notes Due 2023 [Member] | Senior Unsecured Notes [Member]
    
Unsecured Debt 247,700,000 247,500,000
Notes payable, effective interest rate 5.00%  
Notes payable, maturity date 2023  
4.27% Notes Due 2024 [Member] | Senior Unsecured Notes [Member]
    
Unsecured Debt 249,500,000 0
Notes payable, effective interest rate 4.27%  
Notes payable, maturity date 2024  
Secured Notes 0.93% to 6.00% Conventional Mortgage Notes Due 2014 to 2045 [Member] | Secured Debt [Member]
    
Total secured notes payable 905,700,000 934,600,000
1.30% Tax-Exempt Mortgage Note Due 2028 [Member] | Secured Debt [Member]
    
Total secured notes payable 36,300,000 37,700,000
Notes payable, effective interest rate 1.30%  
Notes payable, maturity date 2028  
Other Floating Rate Debt Included In Secured Notes (0.93%) [Member] | Secured Debt [Member]
    
Total secured notes payable $ 175,000,000 $ 175,000,000
Minimum [Member] | Secured Notes 0.93% to 6.00% Conventional Mortgage Notes Due 2014 to 2045 [Member] | Secured Debt [Member]
    
Notes payable, effective interest rate 0.93%  
Notes payable, maturity date 2014  
Maximum [Member] | Secured Notes 0.93% to 6.00% Conventional Mortgage Notes Due 2014 to 2045 [Member] | Secured Debt [Member]
    
Notes payable, effective interest rate 6.00%  
Notes payable, maturity date 2045