XML 26 R47.htm IDEA: XBRL DOCUMENT v2.4.0.6
Notes Payable (Summary Of Indebtedness) (Details) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Senior Unsecured Notes [Member]
Dec. 31, 2011
Senior Unsecured Notes [Member]
Sep. 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]
Sep. 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]
Sep. 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]
Sep. 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]
Sep. 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]
Sep. 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]
Sep. 30, 2012
0.96% - 6.00% Conventional Mortgage Notes, Due 2013 - 2045 [Member]
Secured Debt [Member]
Jun. 30, 2012
0.96% - 6.00% Conventional Mortgage Notes, Due 2013 - 2045 [Member]
Secured Debt [Member]
Dec. 31, 2011
0.96% - 6.00% Conventional Mortgage Notes, Due 2013 - 2045 [Member]
Secured Debt [Member]
Sep. 30, 2012
1.35% Tax-Exempt Mortgage Note Due 2028 [Member]
Secured Debt [Member]
Dec. 31, 2011
1.35% Tax-Exempt Mortgage Note Due 2028 [Member]
Secured Debt [Member]
Sep. 30, 2012
Floating Rate Tax-Exempt Debt Included In Secured Notes (1.35%) [Member]
Secured Debt [Member]
Dec. 31, 2011
Floating Rate Tax-Exempt Debt Included In Secured Notes (1.35%) [Member]
Secured Debt [Member]
Sep. 30, 2012
Floating Rate Debt Included In Secured Notes (0.96% - 1.69%) [Member]
Secured Debt [Member]
Dec. 31, 2011
Floating Rate Debt Included In Secured Notes (0.96% - 1.69%) [Member]
Secured Debt [Member]
Sep. 30, 2012
Minimum [Member]
0.96% - 6.00% Conventional Mortgage Notes, Due 2013 - 2045 [Member]
Secured Debt [Member]
Sep. 30, 2012
Minimum [Member]
Floating Rate Debt Included In Secured Notes (0.96% - 1.69%) [Member]
Secured Debt [Member]
Sep. 30, 2012
Maximum [Member]
0.96% - 6.00% Conventional Mortgage Notes, Due 2013 - 2045 [Member]
Secured Debt [Member]
Sep. 30, 2012
Maximum [Member]
Floating Rate Debt Included In Secured Notes (0.96% - 1.69%) [Member]
Secured Debt [Member]
Sep. 30, 2012
Line of Credit [Member]
Dec. 31, 2011
Line of Credit [Member]
Sep. 30, 2012
Line of Credit [Member]
Commercial Banks [Member]
Dec. 31, 2011
Line of Credit [Member]
Commercial Banks [Member]
Unsecured notes payable $ 1,415,354,000 $ 1,380,755,000 $ 1,381,300,000 $ 1,380,700,000 $ 189,600,000 $ 189,600,000 $ 199,800,000 $ 199,700,000 $ 249,500,000 $ 249,300,000 $ 246,300,000 $ 246,200,000 $ 248,700,000 $ 248,600,000 $ 247,400,000 $ 247,300,000                           $ 34,000,000 $ 0 $ 34,000,000 $ 0
Total secured notes payable 978,371,000 1,051,357,000                             940,300,000   1,012,300,000 38,100,000 39,100,000 38,100,000 39,100,000 206,400,000 206,400,000                
Total notes payable $ 2,393,700,000 $ 2,432,100,000                                                              
Notes payable, effective interest rate         5.93%   5.45%   5.08%   5.75%   4.70%   5.00%     4.92%   1.35%   1.35%       0.96% 0.96% 6.00% 1.69%        
Notes payable, maturity date         2012   2013   2015   2017   2021   2023         2028           2013   2045