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Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Summarized Financial Information, Revenue | $ 219,714 | $ 193,453 | $ 142,842
Equity Method Investment Summarized Financial Information Property Operating Expense | (87,500) | 72,099 | 49,390
Equity Method Investment Summarized Financial Information Depreciation Amortization | (75,492) | 69,399 | 51,830
Equity Method of Investment Summarized Financial Information Operating income/(loss) | 56,722 | 51,955 | 41,622
Equity Method Investment Summarized Financial Information Interest expense | (64,990) | (58,591) | (45,726)
Equity Method Investment Summarized Financial Information Other income/(expense) |  |  | 1
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 175,850 | (42,667) | (36,075)
Income/(loss) from unconsolidated entities | 62,329 | (7,006) | (415)
Equity Method Investment Summarized Financial Information Real Estate, Net | 3,135,757 | 2,941,803 |
Equity Method Investment Summarized Financial Information Cash and cash equivalents | 36,480 | 32,544 |
Equity Method Investment Summarized Financial Information Other assets | 29,891 | 17,849 |
Equity Method Investment Summarized Financial Information Amount Due to Related Party | 7,266 | 2,997 |
Equity Method Investment, Summarized Financial Information, Assets | 3,202,128 | 3,208,392 |
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities | 95,523 | 44,335 |
Equity Method Investment, Summarized Financial Information, Liabilities | 1,717,252 | 1,770,657 |
Equity Method Investment Summarized Financial Information, Equity | 1,484,876 | 1,437,735 |
Investment in unconsolidated entities | 938,906 | 718,226 |
UDR Lighthouse DownREIT L.P. [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | (15,804) |  |
United Dominion Reality L.P. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Income/(loss) from unconsolidated entities | (4,659) | 0 | $ 0
Investment in unconsolidated entities | 166,186 | 0 |
United Dominion Reality L.P. | UDR Lighthouse DownREIT L.P. [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Summarized Financial Information, Revenue | 29,933 |  |
Equity Method Investment Summarized Financial Information Property Operating Expense | (9,991) |  |
Equity Method Investment Summarized Financial Information Depreciation Amortization | (28,934) |  |
Equity Method of Investment Summarized Financial Information Operating income/(loss) | (8,992) |  |
Equity Method Investment Summarized Financial Information Interest expense | (3,632) |  |
Equity Method Investment Summarized Financial Information Other income/(expense) | (3,180) |  |
Equity Method Investment Summarized Financial Information Real Estate, Net | 1,457,244 |  |
Equity Method Investment Summarized Financial Information Cash and cash equivalents | 89 |  |
Equity Method Investment Summarized Financial Information Other assets | 37,228 |  |
Equity Method Investment Summarized Financial Information, Notes Receivable | 126,500 |  |
Equity Method Investment Summarized Financial Information Amount Due to Related Party | 35,293 |  |
Equity Method Investment, Summarized Financial Information, Assets | 1,656,354 |  |
Equity Method Investments Summarized Financial Information Secured Debt, net | 524,052 |  |
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities | 25,487 |  |
Equity Method Investment, Summarized Financial Information, Liabilities | 549,539 |  |
Equity Method Investment Summarized Financial Information, Equity | 1,106,815 |  |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | $ 1,656,354 |  |
Investment in unconsolidated entities |  | $ 0 |

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