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Notes Payable (Summary Of Indebtedness) (Details) (USD $)
9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2011
Minimum [Member]
0.95% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Sep. 30, 2011
Minimum [Member]
Floating Rate Debt Included In Secured Notes (0.95% - 1.68%) [Member]
Sep. 30, 2011
Maximum [Member]
0.95% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Sep. 30, 2011
Maximum [Member]
Floating Rate Debt Included In Secured Notes (0.95% - 1.68%) [Member]
Sep. 30, 2011
Commercial Banks [Member]
Term Loan, Due 2012 [Member]
Dec. 31, 2010
Commercial Banks [Member]
Term Loan, Due 2012 [Member]
Sep. 30, 2011
Senior Unsecured Notes [Member]
7.69% Notes Due 2011 [Member]
Mar. 31, 2011
Senior Unsecured Notes [Member]
7.69% Notes Due 2011 [Member]
Dec. 31, 2010
Senior Unsecured Notes [Member]
7.69% Notes Due 2011 [Member]
Sep. 30, 2011
Senior Unsecured Notes [Member]
5.93% Notes Due 2012 [Member]
Dec. 31, 2010
Senior Unsecured Notes [Member]
5.93% Notes Due 2012 [Member]
Sep. 30, 2011
Senior Unsecured Notes [Member]
5.45% Notes Due 2013 [Member]
Dec. 31, 2010
Senior Unsecured Notes [Member]
5.45% Notes Due 2013 [Member]
Sep. 30, 2011
Senior Unsecured Notes [Member]
5.08% Notes Due 2015 [Member]
Dec. 31, 2010
Senior Unsecured Notes [Member]
5.08% Notes Due 2015 [Member]
Sep. 30, 2011
Senior Unsecured Notes [Member]
5.75% Notes Due 2017 [Member]
Dec. 31, 2010
Senior Unsecured Notes [Member]
5.75% Notes Due 2017 [Member]
Sep. 30, 2011
Senior Unsecured Notes [Member]
4.70% Notes Due 2021 [Member]
Jun. 30, 2011
4.70% Notes Due 2021 [Member]
Sep. 30, 2011
Senior Unsecured Notes [Member]
5.00% Notes Due 2023 [Member]
Jun. 30, 2011
5.00% Notes Due 2023 [Member]
Sep. 30, 2011
Medium-Term Notes [Member]
4.99% Notes Due 2011 [Member]
Jun. 30, 2011
Medium-Term Notes [Member]
4.99% Notes Due 2011 [Member]
Dec. 31, 2010
Medium-Term Notes [Member]
4.99% Notes Due 2011 [Member]
Sep. 30, 2011
0.95% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Dec. 31, 2010
0.95% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member]
Sep. 30, 2011
1.58% Tax-Exempt Mortgage Note Due 2028 [Member]
Dec. 31, 2010
1.58% Tax-Exempt Mortgage Note Due 2028 [Member]
Sep. 30, 2011
Floating Rate Tax-Exempt Debt Included In Secured Notes (1.58%) [Member]
Dec. 31, 2010
Floating Rate Tax-Exempt Debt Included In Secured Notes (1.58%) [Member]
Sep. 30, 2011
Floating Rate Debt Included In Secured Notes (0.95% - 1.68%) [Member]
Dec. 31, 2010
Floating Rate Debt Included In Secured Notes (0.95% - 1.68%) [Member]
Dec. 31, 2010
Commercial Banks [Member]
Sep. 30, 2011
Senior Unsecured Notes [Member]
Dec. 31, 2010
Senior Unsecured Notes [Member]
Sep. 30, 2011
Medium-Term Notes [Member]
Dec. 31, 2010
Medium-Term Notes [Member]
Unsecured notes payable$ 1,380,560,000$ 1,507,757,000     $ 500,000,000  $ 88,000,000$ 189,500,000$ 189,500,000$ 199,700,000$ 199,600,000$ 249,300,000$ 249,200,000$ 246,200,000$ 246,100,000$ 248,600,000 $ 247,300,000   $ 35,400,000        $ 500,000,000$ 1,380,600,000$ 972,400,000$ 1,380,600,000$ 1,507,800,000
Total secured notes payable1,052,544,0001,055,997,000                        1,013,100,0001,015,700,00039,400,00040,300,00039,400,00040,300,000206,500,000189,900,000     
Total notes payable$ 2,433,100,000$ 2,563,800,000                                     
Notes payable, interest percentage                    4.625% 4.875%                
Yield to maturity interest rate on notes payable  0.95%0.95%6.00%1.68%  7.69%7.69% 5.93% 5.45% 5.08% 5.75% 4.70% 5.00% 4.99%4.99%   1.58% 1.58%        
Notes payable, maturity date  2012 2045 2012 2011  2012 2013 2015 2017 2021 2023 2011    2028