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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 1) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Interest rate products | Other Assets [Member] | Designated as Hedging Instrument |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Designated as Hedging Instrument, Fair Value | $ 9 | $ 86
Interest rate products | Other Assets [Member] | Not Designated as Hedging Instrument |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Not Designated as Hedging Instrument, Fair Value | 4 | 2
Interest rate products | Other liabilities | Designated as Hedging Instrument |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 2,112 | 10,368
Interest rate products | Other liabilities | Not Designated as Hedging Instrument |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Liability Not Designated as Hedging Instrument, Fair Value | 0 | 0
United Dominion Reality L.P. |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Designated as Hedging Instrument, Fair Value | 8 | 39
Derivative Liability Designated as Hedging Instrument, Fair Value | 0 | 918
United Dominion Reality L.P. | Interest rate products | Other Assets [Member] | Designated as Hedging Instrument |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Designated as Hedging Instrument, Fair Value | 4 | 37
United Dominion Reality L.P. | Interest rate products | Other Assets [Member] | Not Designated as Hedging Instrument |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Asset Not Designated as Hedging Instrument, Fair Value | 4 | 2
United Dominion Reality L.P. | Interest rate products | Other liabilities | Designated as Hedging Instrument |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 0 | 918
United Dominion Reality L.P. | Interest rate products | Other liabilities | Not Designated as Hedging Instrument |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |
Derivative Liability Not Designated as Hedging Instrument, Fair Value | $ 0 | $ 0

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