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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Aug. 31, 2011 A | Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2011
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract] |  |  |  |
Acres of land acquired | 30.1 |  |  |
Acquisitions of land | $ 40.1 |  |  |
Number of operating properties sold |  |  | 2 |
Number of apartment homes in operating properties sold |  |  | 1,066 |
Number of assets classified as held for sale |  | 0 |  | 0

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- Definition Discontinued Operations and Assets Held for Sale. + Details
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- Definition Number of apartment homes in the operating properties sold during the period. + Details
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- Definition Number of assets classified as held for sale. + Details
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- Definition Number of operating properties sold during the period. + Details
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- Definition The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 + Details
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