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Notes Payable (Summary Of Indebtedness) (Details) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
5.93% Notes Due 2012 [Member]
Senior Unsecured Notes [Member]
Dec. 31, 2011
5.93% Notes Due 2012 [Member]
Senior Unsecured Notes [Member]
Jun. 30, 2012
5.45% Notes Due 2013 [Member]
Senior Unsecured Notes [Member]
Dec. 31, 2011
5.45% Notes Due 2013 [Member]
Senior Unsecured Notes [Member]
Jun. 30, 2012
5.08% Notes Due 2015 [Member]
Senior Unsecured Notes [Member]
Dec. 31, 2011
5.08% Notes Due 2015 [Member]
Senior Unsecured Notes [Member]
Jun. 30, 2012
5.75% Notes Due 2017 [Member]
Senior Unsecured Notes [Member]
Dec. 31, 2011
5.75% Notes Due 2017 [Member]
Senior Unsecured Notes [Member]
Jun. 30, 2012
4.70% Notes Due 2021 [Member]
Senior Unsecured Notes [Member]
Dec. 31, 2011
4.70% Notes Due 2021 [Member]
Senior Unsecured Notes [Member]
Jun. 30, 2012
5.00% Notes Due 2023 [Member]
Senior Unsecured Notes [Member]
Dec. 31, 2011
5.00% Notes Due 2023 [Member]
Senior Unsecured Notes [Member]
Aug. 31, 2012
0.89% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Secured Debt [Member]
Jun. 30, 2012
0.89% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Secured Debt [Member]
Dec. 31, 2011
0.89% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Secured Debt [Member]
Jun. 30, 2012
1.36% Tax-Exempt Mortgage Note Due 2028 [Member]
Secured Debt [Member]
Dec. 31, 2011
1.36% Tax-Exempt Mortgage Note Due 2028 [Member]
Secured Debt [Member]
Jun. 30, 2012
Floating Rate Tax-Exempt Debt Included In Secured Notes (1.36%) [Member]
Secured Debt [Member]
Dec. 31, 2011
Floating Rate Tax-Exempt Debt Included In Secured Notes (1.36%) [Member]
Secured Debt [Member]
Jun. 30, 2012
Floating Rate Debt Included In Secured Notes (0.89% - 1.69%) [Member]
Secured Debt [Member]
Dec. 31, 2011
Floating Rate Debt Included In Secured Notes (0.89% - 1.69%) [Member]
Secured Debt [Member]
Jun. 30, 2012
Minimum [Member]
0.89% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Secured Debt [Member]
Jun. 30, 2012
Minimum [Member]
Floating Rate Debt Included In Secured Notes (0.89% - 1.69%) [Member]
Secured Debt [Member]
Jun. 30, 2012
Maximum [Member]
0.89% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Secured Debt [Member]
Jun. 30, 2012
Maximum [Member]
Floating Rate Debt Included In Secured Notes (0.89% - 1.69%) [Member]
Secured Debt [Member]
Jun. 30, 2012
Line of Credit [Member]
Commercial Banks [Member]
Dec. 31, 2011
Line of Credit [Member]
Commercial Banks [Member]
Unsecured notes payable $ 1,381,152,000 $ 1,380,755,000 $ 189,600,000 $ 189,600,000 $ 199,800,000 $ 199,700,000 $ 249,400,000 $ 249,300,000 $ 246,300,000 $ 246,200,000 $ 248,600,000 $ 248,600,000 $ 247,400,000 $ 247,300,000                           $ 0 $ 0
Total secured notes payable 1,015,260,000 1,051,357,000                           976,900,000 1,012,300,000 38,400,000 39,100,000 38,400,000 39,100,000 206,500,000 206,400,000            
Total notes payable $ 2,396,400,000 $ 2,432,100,000                                                      
Notes payable, effective interest rate     5.93%   5.45%   5.08%   5.75%   4.70%   5.00%   5.07% 4.92%   1.36%   1.36%       0.89% 0.89% 6.00% 1.69%    
Notes payable, maturity date     2012   2013   2015   2017   2021   2023         2028           2012   2045