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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock option and restricted stock activities | A summary of UDR’s stock option and restricted stock activities during the year ended December 31, 2015 is as follows:
| Option Outstanding |  | Option Exercisable |  | Restricted Stock
| Number of Options |  | Weighted Average Exercise Price |  | Number of Options |  | Weighted Average Exercise Price |  | Number of shares |  | Weighted Average Fair Value Per Restricted Stock
Balance, December 31, 2014 | 2,265,842 |  |  | $ | 12.82 |  |  | 2,265,842 |  |  | $ | 12.82 |  |  | 999,978 |  |  | $ | 23.98 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | 551,293 |  |  | 32.67 |
Exercised | (30,879 | ) |  | 25.10 |  |  | (30,879 | ) |  | 25.10 |  |  | — |  |  | — |
Vested | — |  |  | — |  |  | — |  |  | — |  |  | (736,204 | ) |  | 23.52 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | (14,691 | ) |  | 23.24 |
Balance, December 31, 2015 | 2,234,963 |  |  | $ | 12.65 |  |  | 2,234,963 |  |  | $ | 12.65 |  |  | 800,376 |  |  | $ | 30.40 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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