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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 |  |  |  |
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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 |  |  |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 2: 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + 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 -Section 02 -Article 5 -Subsection 19, 20, 22 Reference 2: 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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