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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 |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  | 9 Months Ended |  |  |  |  |  |  |  |  |
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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 payable | 1,052,544,000 | 1,055,997,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,013,100,000 | 1,015,700,000 | 39,400,000 | 40,300,000 | 39,400,000 | 40,300,000 | 206,500,000 | 189,900,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Carrying value as of the balance sheet date , including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 02 -Subsection 19, 20, 22 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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