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Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands | Dec. 31, 2015 Communities | Dec. 31, 2015 | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of Real Estate Properties | 133 | 2 |  |
Investment in unconsolidated entities |  |  | $ 938,906 | $ 718,226
United Dominion Reality L.P. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of Real Estate Properties | Communities | 57 |  |  |
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] |  |  |  |
Number of Real Estate Properties |  | 13 |  |
Number of Units in Real Estate Property |  | 6,261 |  |
Investment in unconsolidated entities |  |  |  | $ 0
Equity Method Investment, Ownership Percentage |  | 41.60% |  | 0.00%

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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