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Notes Payable (Summary of Indebtedness) (Details) (USD $) |  |  |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended |  |  |  |  |  |  |  |  |
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Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2011 Minimum [Member] 1.12% - 6.00% Conventional Mortgage Notes, Due 2011 Till 2045 Member | Jun. 30, 2011 Minimum [Member] 1.12%-1.70$ Floating Rate Debt [Member] | Jun. 30, 2011 Maximum [Member] 1.12% - 6.00% Conventional Mortgage Notes, Due 2011 Till 2045 Member | Jun. 30, 2011 Maximum [Member] 1.12%-1.70$ Floating Rate Debt [Member] | Jun. 30, 2011 Commercial Banks [Member] Term Loan, Due 2012 [Member] | Dec. 31, 2010 Commercial Banks [Member] Term Loan, Due 2012 [Member] | Jun. 30, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member] | Dec. 31, 2010 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member] | Jun. 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] | Jun. 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] | Jun. 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] | Jun. 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] | Jun. 30, 2011 Senior Unsecured Notes [Member] 4.70% Notes Due 2021 [Member] | Jun. 30, 2011 4.70% Notes Due 2021 [Member] | Jun. 30, 2011 Senior Unsecured Notes [Member] 5.00% Notes Due 2023 [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] | Jun. 30, 2011 1.12% - 6.00% Conventional Mortgage Notes, Due 2011 Till 2045 Member | Dec. 31, 2010 1.12% - 6.00% Conventional Mortgage Notes, Due 2011 Till 2045 Member | Jun. 30, 2011 1.74% Tax Exempt Mortgage Note Due 2028 Member | Dec. 31, 2010 1.74% Tax Exempt Mortgage Note Due 2028 Member | Jun. 30, 2011 1.74 % Floating Rate Tax Exempt Debt [Member] | Dec. 31, 2010 1.74 % Floating Rate Tax Exempt Debt [Member] | Jun. 30, 2011 1.12%-1.70$ Floating Rate Debt [Member] | Dec. 31, 2010 1.12%-1.70$ Floating Rate Debt [Member] | Dec. 31, 2010 Commercial Banks [Member] | Jun. 30, 2011 Senior Unsecured Notes [Member] | Dec. 31, 2010 Senior Unsecured Notes [Member] | Jun. 30, 2011 Medium-Term Notes [Member] | Dec. 31, 2010 Medium-Term Notes [Member]
Total unsecured notes payable | $ 1,380,368,000 |  | $ 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 | $ 248,500,000 |  | $ 247,200,000 |  | $ 35,400,000 |  |  |  |  |  |  |  |  | $ 500,000,000 | $ 1,380,400,000 | $ 972,400,000 | $ 1,380,400,000 | $ 1,507,800,000
Total secured notes payable | 1,053,699,000 |  | 1,055,997,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,014,000,000 | 1,015,700,000 | 39,700,000 | 40,300,000 | 39,700,000 | 40,300,000 | 189,900,000 | 189,900,000 |  |  |  |  |
Total notes payable | $ 2,434,100,000 |  | $ 2,563,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, interest percentage | 4.99% | 7.69% |  | 0.99% | 0.99% | 6.00% | 1.64% |  |  | 7.69% |  | 5.93% |  | 5.45% |  | 5.08% |  | 5.75% |  |  | 4.70% |  | 4.99% |  |  |  | 1.53% |  | 1.53% |  |  |  |  |  |  |  |
Notes payable, maturity date |  |  |  | 2012 |  | 2045 |  | 2012 |  | 2011 |  | 2012 |  | 2013 |  | 2015 |  | 2017 |  | 2021 |  | 2023 | 2011 |  |  |  | 2028 |  |  |  |  |  |  |  |  |  |

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