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Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Nov. 04, 2011 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010
Investments In Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |  |
Total assets |  | $ 1,322,500,000 | [1] |  |  | $ 1,322,500,000 | [1] |  |  | $ 935,300,000
Total third-party debt |  | 1,066,900,000 | [1] |  |  | 1,066,900,000 | [1] |  |  | 810,100,000
Total equity |  | 223,300,000 | [1] |  |  | 223,300,000 | [1] |  |  | 105,300,000
Total revenues |  | 46,100,000 |  | 35,300,000 |  | 115,500,000 |  | 103,600,000 |  |
Net loss |  | (7,400,000) |  | (5,000,000) |  | (13,800,000) |  | (15,200,000) |  |
Equity in loss |  | $ (556,000) | [2] | $ (244,000) | [2] | $ (166,000) | [2] | $ (785,000) | [2] |
Number of unconsolidated joint venture ownership interests sold |  |  |  |  |  | 3 |  |  |  |
Number of multifamily properties acquired by our discretionary funds | 5 |  |  |  |  | 13 |  |  |  |
[1] | During the nine months ended September 30, 2011, we sold our ownership interest in three unconsolidated joint ventures and our discretionary funds (the "Funds") acquired thirteen multifamily properties.
[2] | Equity in income (loss) excludes our ownership interest of fee income from various property management services with our joint ventures.

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