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Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Financial information relating to unconsolidated joint ventures operations |  |  |  |  |
UDR recorded loss from unconsolidated entities | $ (2,412) | $ (1,348) | $ (5,103) | $ (2,680) |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |
Investment in unconsolidated joint ventures | 580,098 |  | 580,098 |  | 213,040
Unconsolidated Joint Venture One U D R Met Life Partnership [Member] |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |
Investment in unconsolidated joint ventures | 100,200 |  | 100,200 |  | 133,800
Unconsolidated Joint Ventures [Member] |  |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |  |
Revenues | 74,725 | 48,414 | 137,750 | 95,005 |
Real estate depreciation and amortization | 26,489 | 16,737 | 52,374 | 33,338 |
Net loss | 3,544 | (3,142) | (5,077) | (8,731) |
UDR recorded loss from unconsolidated entities | 2,412 | 1,348 | 5,103 | 2,680 |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |
Real estate, net | 3,550,889 |  | 3,550,889 |  | 2,908,623
Total assets | 3,655,128 |  | 3,655,128 |  | 2,998,866
Amount due to UDR | 12,853 |  | 12,853 |  | 6,251
Third party debt | 1,770,990 |  | 1,770,990 |  | 1,499,419
Total liabilities | 1,823,697 |  | 1,823,697 |  | 1,561,396
Total equity | 1,816,754 |  | 1,816,754 |  | 1,437,470
Equity held by non-controlling interest | $ 14,677 |  | $ 14,677 |  | $ 14,641

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