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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 3) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Offsetting Derivative Assets [Abstract] |  |  |  |
Derivative Asset Designated as Hedging Instrument, Fair Value | $ 299 |  | $ 0 |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) | 299 | [1] | 0 | [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | (253) |  | 0 |
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 0 |  | 0 |
Net Amount | 46 |  | 0 |
Offsetting Derivative Liabilities [Abstract] |  |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 2,382 |  | 4,965 |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b) | 2,382 | [2] | 4,965 | [2]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | (253) |  | 0 |
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 0 |  | 0 |
Net Amount | 2,129 |  | 4,965 |
United Dominion Reality L.P. [Member] |  |  |  |
Offsetting Derivative Assets [Abstract] |  |  |  |
Derivative Asset Designated as Hedging Instrument, Fair Value | 5 |  | 0 |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) | 5 | [1] | 0 | [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | 0 |  | 0 |
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 0 |  | 0 |
Net Amount | 5 |  | 0 |
Offsetting Derivative Liabilities [Abstract] |  |  |  |
Derivative Liability Designated as Hedging Instrument, Fair Value | 1,324 |  | 2,731 |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |  | 0 |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b) | 1,324 | [2] | 2,731 | [2]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | 0 |  | 0 |
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 0 |  | 0 |
Net Amount | $ 1,324 |  | $ 2,731 |
[1] | Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote.
[2] | Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote

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