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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total | $ (6,393) | $ (8,695) | $ (469)
Derivative, Collateral, Obligation to Return Securities | 0 | 27 |
Derivative, Collateral, Obligation to Return Cash | 0 | 0 |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 13 | 61 |
Derivative Asset, Not Subject to Master Netting Arrangement | 0 | 0 |
Derivative Asset | 13 | 88 |
United Dominion Reality L P [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total | (82) | (285) | (348)
Derivative, Collateral, Obligation to Return Securities | 0 | 0 |
Derivative, Collateral, Obligation to Return Cash | 0 | 0 |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 8 | 39 |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 8 | 39 |
Derivative Asset, Not Subject to Master Netting Arrangement | 0 | 0 |
Derivative Asset | $ 8 | $ 39 |
Interest rate contracts | Cash Flow Hedging |  |  |
Derivative [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total |  |  | $ (469)

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