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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Tables) | 12 Months Ended
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Dec. 31, 2015
Entity Information [Line Items] |
Offsetting Assets [Table Text Block] | The Company has elected not to offset derivative positions in the consolidated financial statements. The tables below present the effect on its financial position had the Company made the election to offset its derivative positions as of December 31, 2015 and December 31, 2014 (dollars in thousands):
Offsetting of Derivative Assets |  |  |  |  |  |  |  |
|  | Gross Amounts of Recognized Assets |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) |  | Gross Amounts Not Offset in the Consolidated Balance Sheets |  | Net Amount
|  |  |  |  | Financial Instruments |  | Cash Collateral Received |
December 31, 2015 |  | $ | 13 |  |  | $ | — |  |  | $ | 13 |  |  | $ | — |  |  | $ | — |  |  | $ | 13 |
December 31, 2014 |  | $ | 88 |  |  | $ | — |  |  | $ | 88 |  |  | $ | (27 | ) |  | $ | — |  |  | $ | 61 |
Outstanding interest rate derivatives | As of December 31, 2015, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):
Product |  | Number of Instruments |  | Notional
Interest rate swaps |  | 5 |  | $ | 315,000 |
Interest rate caps |  | 2 |  | $ | 203,166 |
Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP or the Company has elected to not apply hedge accounting. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the years ended December 31, 2015 and 2014, and a gain of $0.3 million for the year ended December 31, 2013. As of December 31, 2015, the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):
Product |  | Number of Instruments |  | Notional
Interest rate caps |  | 3 |  | $ | 133,107 |
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet | The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2015 and 2014 (dollars in thousands):
| Asset Derivatives (included in Other assets) |  | Liability Derivatives (included in Other liabilities)
| Fair Value at: |  | Fair Value at:
| December 31, 2015 |  | December 31, 2014 |  | December 31, 2015 |  | December 31, 2014
Derivatives designated as hedging instruments: |  |  |  |  |  |  |
Interest rate products | $ | 9 |  |  | $ | 86 |  |  | $ | 2,112 |  |  | $ | 10,368 |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |
Interest rate products | $ | 4 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Effect of Company's derivative financial instruments on Consolidated Statements of Operation | The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the years ended December 31, 2015, 2014, and 2013 (dollars in thousands):
Derivatives in Cash Flow Hedging Relationships |  | Unrealized holding gain/(loss) Recognized in OCI (Effective Portion) |  | Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion) |  | Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing)
| Year ended December 31, |  | Year ended December 31, | Year ended December 31,
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013 | 2015 |  | 2014 |  | 2013
Interest rate products |  | $ | (6,393 | ) |  | $ | (8,695 | ) |  | $ | (469 | ) |  | $ | (2,251 | ) |  | $ | (4,834 | ) |  | $ | (6,851 | ) |  | $ | (11 | ) |  | $ | 3 |  |  | $ | — |
Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations |
|  | Gain/(Loss) Recognized in Interest income and other income/(expense), net
| Year ended December 31,
Derivatives Not Designated as Hedging Instruments | 2015 |  | 2014 |  | 2013
Interest rate products |  | $ | (23 | ) |  | $ | (4 | ) |  | 271 |
Offsetting Liabilities [Table Text Block] |
Offsetting of Derivative Liabilities |  |  |  |  |  |  |  |
|  | Gross Amounts of Recognized Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a) |  | Gross Amounts Not Offset in the Consolidated Balance Sheets |  | Net Amount
|  |  |  |  | Financial Instruments |  | Cash Collateral Posted |
December 31, 2015 |  | $ | 2,112 |  |  | $ | — |  |  | $ | 2,112 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,112 |
December 31, 2014 |  | $ | 10,368 |  |  | $ | — |  |  | $ | 10,368 |  |  | $ | (27 | ) |  | $ | — |  |  | $ | 10,341 |
United Dominion Reality L.P. |
Entity Information [Line Items] |
Offsetting Assets [Table Text Block] | The General Partner has elected not to offset derivative positions in the consolidated financial statements. The table below presents the effect on the Operating Partnership's financial position had the General Partner made the election to offset its derivative positions as of December 31, 2015 and December 31, 2014:
Offsetting of Derivative Assets |  |  |  |  |  |  |  |
|  | Gross Amounts of Recognized Assets |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) |  | Gross Amounts Not Offset in the Consolidated Balance Sheets |  | Net Amount
|  |  |  |  | Financial Instruments |  | Cash Collateral Received |
December 31, 2015 |  | $ | 8 |  |  | $ | — |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |
December 31, 2014 |  | $ | 39 |  |  | $ | — |  |  | $ | 39 |  |  | $ | — |  |  | $ | — |  |  | $ | 39 |
Outstanding interest rate derivatives | As of December 31, 2015, the Operating Partnership had the following outstanding interest rate derivatives designated as cash flow hedges of interest rate risk (dollars in thousands):
Product |  | Number of Instruments |  | Notional
Interest rate caps |  | 1 |  | $ | 96,327 |
Derivatives not designated as hedges are not speculative and are used to manage the Operating Partnership’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP or the General Partner has elected to not apply hedge accounting. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in losses of less than $0.1 million for the years ended December 31, 2015, 2014, and 2013. As of December 31, 2015, we had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):
Product |  | Number of Instruments |  | Notional
Interest rate caps |  | 3 |  | $ | 98,932 |
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet | The table below presents the fair value of the Operating Partnership’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2015 and 2014 (dollars in thousands):
| Asset Derivatives (included in Other assets) |  | Liability Derivatives (Included in Other liabilities)
| Fair Value at: |  | Fair Value at:
| December 31, 2015 |  | December 31, 2014 |  | December 31, 2015 |  | December 31, 2014
Derivatives designated as hedging instruments: |  |  |  |  |  |  |
Interest rate products | $ | 4 |  |  | $ | 37 |  |  | $ | — |  |  | $ | 918 |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |
Interest rate products | $ | 4 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Effect of Company's derivative financial instruments on Consolidated Statements of Operation | The tables below present the effect of the derivative financial instruments on the Consolidated Statements of Operations for the years ended December 31, 2015, 2014, and 2013 (dollars in thousands):
Derivatives in Cash Flow Hedging Relationships |  | Unrealized holding gain/(loss) Recognized in OCI (Effective Portion) |  | Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion) |  | Gain/(Loss) Recognized in Interest expense (ineffective Portion and Amount Excluded from Effectiveness Testing)
| Year ended December 31, |  | Year ended December 31, |  | Year ended December 31,
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
Interest rate products |  | $ | (82 | ) |  | $ | (285 | ) |  | $(348) |  | $ | (1,044 | ) |  | $ | (2,275 | ) |  | $ | (3,431 | ) |  | $ | (11 | ) |  | $ | — |  |  | $ | — |
Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations |
Derivatives Not Designated as Hedging Instruments |  | Gain/(Loss) Recognized in Interest income and other income/(expense), net
Year ended December 31,
2015 |  | 2014 |  | 2013
Interest rate products |  | $ | (23 | ) |  | $ | (3 | ) |  | $ | (9 | )
Offsetting Liabilities [Table Text Block] |
Offsetting of Derivative Liabilities |  |  |  |  |  |  |  |
|  | Gross Amounts of Recognized Liabilities |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b) |  | Gross Amounts Not Offset in the Consolidated Balance Sheets |  | Net Amount
|  |  |  |  | Financial Instruments |  | Cash Collateral Posted |
December 31, 2015 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
December 31, 2014 |  | $ | 918 |  |  | $ | — |  |  | $ | 918 |  |  | $ | — |  |  | $ | — |  |  | $ | 918 |
(b) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

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