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Investments In Joint Ventures (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | May 31, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member] | Sep. 30, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member] | Jun. 30, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]
Number of joint ventures accounted for under equity method investments |  |  |  | 3 |  |  |  |  |
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 | 2,400,000 | 2,800,000 |  | 7,500,000 | 8,800,000 |  |  |  |
Number of operating properties sold | 2 |  | 2 |  |  | 11 | 14 |  |
Number of apartment homes in operating properties sold | 500 |  | 1,296 |  |  | 3,213 | 3,098 |  |
Proceeds from sale of 14 operating properties |  |  |  |  |  |  | 200,200,000 |  |
Gain on sale of unconsolidated JV property |  |  |  |  |  |  | 13,000,000 |  |
Promoted equity interest in assets sold during period |  |  |  |  |  |  |  | $ 1,200,000 | $ 3,800,000

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