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Notes Payable (Summary Of Indebtedness) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010
Debt Instrument [Line Items] |  |
Unsecured notes payable | $ 1,380,755,000 | $ 1,507,757,000
Total secured notes payable | 1,051,357,000 | 1,055,997,000
Total notes payable | 2,432,100,000 | 2,563,800,000
Commercial Banks [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable |  | 500,000,000
Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable | 1,380,700,000 | 972,400,000
Term Loan, Due 2012 [Member] | Commercial Banks [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable |  | 500,000,000
Notes payable, maturity date | 2012 |
7.69% Notes Due 2011 [Member] | Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable |  | 88,000,000
Notes payable, maturity date | 2012 |
Effective annual interest rate on secured credit | 7.69% |
5.93% Notes Due 2012 [Member] | Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable | 189,600,000 | 189,500,000
Notes payable, maturity date | 2013 |
Effective annual interest rate on secured credit | 5.93% |
5.45% Notes Due 2013 [Member] | Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable | 199,700,000 | 199,600,000
Notes payable, maturity date | 2015 |
Effective annual interest rate on secured credit | 5.45% |
5.08% Notes Due 2015 [Member] | Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable | 249,300,000 | 249,200,000
Notes payable, maturity date | 2017 |
Effective annual interest rate on secured credit | 5.08% |
5.75% Notes Due 2017 [Member] | Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable | 246,200,000 | 246,100,000
Effective annual interest rate on secured credit | 5.75% |
4.70% Notes Due 2021 [Member] | Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable | 248,600,000 |
Notes payable, maturity date | 2021 |
Effective annual interest rate on secured credit | 4.70% |
5.00% Notes Due 2023 [Member] | Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable | 247,300,000 |
Notes payable, maturity date | 2023 |
Effective annual interest rate on secured credit | 5.00% |
4.99% Notes Due 2011 [Member] | Medium-Term Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable |  | 35,400,000
Notes payable, maturity date | 2011 |
Effective annual interest rate on secured credit | 4.99% |
0.91% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member] |  |
Debt Instrument [Line Items] |  |
Total secured notes payable | 1,012,300,000 | 1,015,700,000
1.59% Tax-Exempt Mortgage Note, Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Total secured notes payable | 39,100,000 | 40,300,000
Notes payable, maturity date | 2028 |
Effective annual interest rate on secured credit | 1.59% |
Floating Rate Tax-Exempt Debt Inlcuded In Secured Notes (1.59%) [Member] |  |
Debt Instrument [Line Items] |  |
Total secured notes payable | 39,100,000 | 40,300,000
Effective annual interest rate on secured credit | 1.59% |
Floating Rate Debt Included In Secured Notes (0.91% - 1.73%) [Member] |  |
Debt Instrument [Line Items] |  |
Total secured notes payable | 206,400,000 | 189,900,000
Value Of Real Estate Assets, At Cost [Member] |  |
Debt Instrument [Line Items] |  |
Value of real estate assets, at cost, subject to secured notes | 1,651,000,000 | 1,629,600,000
Total [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured notes payable | $ 1,380,700,000 | $ 1,507,800,000
Minimum [Member] | 0.91% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, maturity date | 2012 |
Effective annual interest rate on secured credit | 0.91% |
Minimum [Member] | Floating Rate Debt Included In Secured Notes (0.91% - 1.73%) [Member] |  |
Debt Instrument [Line Items] |  |
Effective annual interest rate on secured credit | 0.91% |
Maximum [Member] | 0.91% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable, maturity date | 2045 |
Effective annual interest rate on secured credit | 6.00% |
Maximum [Member] | Floating Rate Debt Included In Secured Notes (0.91% - 1.73%) [Member] |  |
Debt Instrument [Line Items] |  |
Effective annual interest rate on secured credit | 1.73% |

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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 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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 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 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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