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Notes Payable (Narrative) (Details) (USD $) | 1 Months Ended | 9 Months Ended | 3 Months Ended |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  |  | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Jun. 30, 2011 | Sep. 30, 2011 years | Sep. 30, 2010 | Jun. 30, 2011 Commercial Banks [Member] Term Loan, Due 2012 [Member] | Sep. 30, 2011 Senior Unsecured Notes [Member] 4.70% Notes Due 2021 [Member] | Jun. 30, 2011 Senior Unsecured Notes [Member] 4.70% Notes Due 2021 [Member] | Sep. 30, 2011 Senior Unsecured Notes [Member] 5.00% Notes Due 2023 [Member] | Jun. 30, 2011 Senior Unsecured Notes [Member] 5.00% Notes Due 2023 [Member] | Mar. 31, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member] | Sep. 30, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member] | Jun. 30, 2011 Medium-Term Notes [Member] 4.99% Notes Due 2011 [Member] | Sep. 30, 2011 Medium-Term Notes [Member] 4.99% Notes Due 2011 [Member] | Sep. 30, 2011 Floating Rate Debt [Member] | Sep. 30, 2010 Floating Rate Debt [Member] | Jun. 30, 2011 4.70% Notes Due 2021 [Member] | Sep. 30, 2011 4.70% Notes Due 2021 [Member] | Jun. 30, 2011 5.00% Notes Due 2023 [Member] | Sep. 30, 2011 5.00% Notes Due 2023 [Member] | Sep. 30, 2011 0.95% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member] | Sep. 30, 2011 0.95% - 6.00% Conventional Mortgage Notes, Due 2012 - 2045 [Member] | Sep. 30, 2011 Line Of Credit [Member] | Sep. 30, 2011 Line Of Credit [Member] | Sep. 30, 2011 Line Of Credit [Member] | Sep. 30, 2011 Letter Of Credit [Member]
Amount of current borrowing capacity under unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 | $ 500,000,000 |
Prior maturity period of unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | August 2012 |  |
Current maturity period of unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | September 2015 |  |  |
Optional extension period of unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | September 2016 |  |  |
Maximum term of bid rate loans (days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180 |
Lesser of amount stated or the amount available under the line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |
Maximum borrowing capacity under unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750,000,000 |  |  | 100,000,000
Outstanding letters of credit under credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,600,000
Available amount under unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 488,400,000 | 488,400,000 |
Repayment of senior unsecured notes |  | 500,000,000 |  | 500,000,000 |  |  |  |  | 88,000,000 |  | 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured third party note payable to one of our fully-consolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,500,000 | 31,500,000 |  |  |  |
Investment ownership percentage in fully-consolidated joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |
Original maturity period of secured third-party note payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | August 2011 |  |  |  |  |
Extended maturity period of secured third-party note payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | August 2012 |  |  |  |  |
Interest rate of notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.625% |  | 4.875% |  |  |  |  |  |  |
Yield to maturity interest rate on notes payable |  |  |  |  | 4.70% |  | 5.00% |  | 7.69% | 7.69% | 4.99% | 4.99% |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal face amount of senior unsecured notes | 500,000,000 |  |  |  |  | 250,000,000 |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from notes payable |  | 495,705,000 | 57,601,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from notes payable | 491,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2021 |  | Jun. 01, 2023 |  |  |  |  |  |  |
Discount on notes payable face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.404% |  | 98.878% |  |  |  |  |  |
Write off of unamortized loan costs |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on floating rate debt |  | 4.80% |  |  |  |  |  |  |  |  |  |  | 1.10% | 1.30% |  |  |  |  |  |  |  |  |  |
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) |  | 7.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash inflow from borrowings supported by a written promise to pay an obligation that is uncollateralized (where debt is not backed by the pledge of collateral) net of loan and other issuance costs such as the costs to evaluate and record guarantees, collateral, and other security arrangements, negotiate loan terms, prepare and process loan documents, and close the transaction. + Details
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- Definition Secured third party note payable to one of our fully-consolidated joint ventures, in which we hold a 25% ownership, which was originally scheduled to mature in August 2011 and was contractually extended to August 2012. + Details
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- Definition Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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