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Notes Payable (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended |  |  | 9 Months Ended | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
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Oct. 31, 2012 | Sep. 30, 2012 Y | Sep. 30, 2012 Letter Of Credit [Member] | Sep. 30, 2012 Floating Rate Debt [Member] | Sep. 30, 2011 Floating Rate Debt [Member] | Sep. 30, 2012 Line of Credit [Member] | Jun. 30, 2012 0.96% - 6.00% Conventional Mortgage Notes, Due 2013 - 2045 [Member] | Jun. 30, 2012 0.96% - 6.00% Conventional Mortgage Notes, Due 2013 - 2045 [Member] Secured Debt [Member] | Sep. 30, 2012 Secured Notes Five Point Zero Seven Percentage Conventional Mortgage Note Due Two Thousand Twelve [Member] | Sep. 30, 2012 Secured Notes Five Point Zero Seven Percentage Conventional Mortgage Note Due Two Thousand Twelve [Member] Secured Debt [Member] | Sep. 30, 2012 Secured Notes Four Point Nine Two Percentage Conventional Mortgage Note Due Two Thousand Twelve [Member] | Sep. 30, 2012 Secured Notes Four Point Nine Two Percentage Conventional Mortgage Note Due Two Thousand Twelve [Member] Secured Debt [Member]
Amount of current borrowing capacity under unsecured credit facility |  |  |  |  |  | $ 500 |  |  |  |  |  |
Unsecured Credit Facility, Expiration Date |  |  |  |  |  | Sep. 22, 2015 |  |  |  |  |  |
Optional extension period of unsecured credit facility |  |  |  |  |  | September 2016 |  |  |  |  |  |
Maximum borrowing capacity under unsecured credit facility |  |  | 100 |  |  | 750 |  |  |  |  |  |
Maximum term of bid rate loans (days) |  |  |  |  |  | 180 |  |  |  |  |  |
Lesser of amount stated or the amount available under the line of credit |  |  |  |  |  | 250 |  |  |  |  |  |
Outstanding letters of credit under credit facility |  |  | 10.9 |  |  |  |  |  |  |  |  |
Available amount under unsecured credit facility |  |  |  |  |  | 455.1 |  |  |  |  |  |
Notes payable, effective interest rate |  |  |  |  |  |  |  | 4.92% |  | 5.07% |  | 4.92%
Repayments of secured third-party notes payable | $ 31.5 |  |  |  |  |  | $ 33.7 |  | $ 19.3 |  | $ 16.7 |
Extended Maturity Period Of Secured Third Party Note Payable |  | August 2013 |  |  |  |  |  |  |  |  |  |
Weighted average interest rate on floating rate debt |  | 4.80% |  | 1.10% | 1.10% |  |  |  |  |  |  |
Weighted average maturity of indebtedness (including unsecured line of credit) (in years) |  | 6.2 |  |  |  |  |  |  |  |  |  |

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- Definition Maximum term of bid rate loans in days related to the line of credit. Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates + References No definition available. + Details
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- Definition Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates. These bid rate loans have terms of 180 days or less and may not exceed the lesser of $250 million or the remaining amount available under the line of credit. + References No definition available. + Details
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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 Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + 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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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