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Investments In Joint Ventures (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Feb. 28, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Investments In Joint Ventures [Abstract] |  |  |  |  |  |
Number of joint ventures accounted for under equity method investments |  |  |  | 2 | 3 | 2
Equity method investment ownership percentage |  | 20.00% |  | 20.00% |  |
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures |  | $ 0 |  | $ 0 |  |
Fees earned for property and asset management, construction, development, and other services to joint ventures |  | 2,000,000 | 2,400,000 | 6,600,000 | 7,500,000 |
Number of apartment homes in joint venture's operating properties sold | 558 |  |  |  |  |
Proceeds from sale of 2 operating properties | 65,600,000 |  |  |  |  |
Gain on sale of unconsolidated JV property | $ 3,600,000 |  |  |  |  |

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- Definition Our proportionate share of the gain (loss) on the sale of an unconsolidated joint venture property or properties during the period. Gain (loss) is included in equity in income (loss) on the income statement. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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