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Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) (Tables) | 12 Months Ended
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Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of basic and diluted income/(loss) per share for the periods presented (dollars and shares in thousands, except per share data):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Numerator for income/(loss) per share: |  |  |  |  |
Income/(loss) from continuing operations | $ | 105,482 |  |  | $ | 16,260 |  |  | $ | 2,340 |
Gain/(loss) on sale of real estate owned, net of tax | 251,677 |  |  | 143,572 |  |  | — |
(Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership | (16,773 | ) |  | (5,511 | ) |  | 48 |
(Income)/loss from continuing operations attributable to noncontrolling interests | (3 | ) |  | 3 |  |  | 60 |
Income/(loss) from continuing operations attributable to UDR, Inc. | 340,383 |  |  | 154,324 |  |  | 2,448 |
Distributions to preferred stockholders - Series E (Convertible) | (3,722 | ) |  | (3,724 | ) |  | (3,724 | )
Income/(loss) from continuing operations attributable to common stockholders - basic | 336,661 |  |  | 150,600 |  |  | (1,276 | )
Dilutive distributions to preferred stockholders - Series E (Convertible) | 3,722 |  |  | — |  |  | — |
Income/(loss) from continuing operations attributable to common stockholders - dilutive | $ | 340,383 |  |  | $ | 150,600 |  |  | $ | (1,276 | )
Income/(loss) from discontinued operations, net of tax | $ | — |  |  | $ | 10 |  |  | $ | 43,942 |
(Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership | — |  |  | — |  |  | (1,578 | )
Income/(loss) from discontinued operations attributable to common stockholders | $ | — |  |  | $ | 10 |  |  | $ | 42,364 |
Net income/(loss) attributable to common stockholders | $ | 336,661 |  |  | $ | 150,610 |  |  | $ | 41,088 |
Denominator for income/(loss) per share - basic and diluted: |  |  |  |  |
Weighted average common shares outstanding | 259,873 |  |  | 252,707 |  |  | 250,684 |
Non-vested restricted stock awards | (1,204 | ) |  | (1,179 | ) |  | (715 | )
Denominator for income/(loss) per share - basic | 258,669 |  |  | 251,528 |  |  | 249,969 |
Incremental shares issuable from assumed conversion of dilutive preferred stock, stock options and unvested restricted stock | 5,083 |  |  | 1,917 |  |  | — |
Denominator for income/(loss) per share - diluted | 263,752 |  |  | 253,445 |  |  | 249,969 |
Income/(loss) per weighted average common share - basic: |  |  |  |  |
Income/(loss) from continuing operations attributable to common stockholders | $ | 1.30 |  |  | $ | 0.60 |  |  | $ | (0.01 | )
Income/(loss) from discontinued operations attributable to common stockholders | — |  |  | — |  |  | 0.17 |
Net income/(loss) attributable to common stockholders | $ | 1.30 |  |  | $ | 0.60 |  |  | $ | 0.16 |
Income/(loss) per weighted average common share - diluted: |  |  |  |  |
Income/(loss) from continuing operations attributable to common stockholders | $ | 1.29 |  |  | $ | 0.59 |  |  | $ | (0.01 | )
Income/(loss) from discontinued operations attributable to common stockholders | — |  |  | — |  |  | 0.17 |
Net income/(loss) attributable to common stockholders | $ | 1.29 |  |  | $ | 0.59 |  |  | $ | 0.16 |
United Dominion Reality L.P. |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of basic and diluted income/(loss) per OP Unit for the periods presented (dollars in thousands, except per OP Unit data):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Numerator for income/(loss) per OP Unit — basic and diluted: |  |  |  |  |
Income/(loss) from continuing operations | $ | 56,940 |  |  | $ | 33,544 |  |  | $ | 32,766 |
Gain/(loss) on sale of real estate owned | 158,123 |  |  | 63,635 |  |  | — |
(Income)/loss from continuing operations attributable to noncontrolling interests | (1,762 | ) |  | (952 | ) |  | (4,114 | )
Income/(loss) from continuing operations attributable to OP unitholders | $ | 213,301 |  |  | $ | 96,227 |  |  | $ | 28,652 |
Income/(loss) from discontinued operations | $ | — |  |  | $ | — |  |  | $ | 45,176 |
(Income)/loss from discontinued operations attributable to noncontrolling interests | — |  |  | — |  |  | (452 | )
Income/(loss) from discontinued operations attributable to OP unitholders | $ | — |  |  | $ | — |  |  | $ | 44,724 |
Net income/(loss) | $ | 215,063 |  |  | $ | 97,179 |  |  | $ | 77,942 |
Net (income)/loss attributable to noncontrolling interests | (1,762 | ) |  | (952 | ) |  | (4,566 | )
Net income/(loss) attributable to OP unitholders | $ | 213,301 |  |  | $ | 96,227 |  |  | $ | 73,376 |
Denominator for income/(loss) per OP Unit — basic and diluted: |  |  |  |  |
Weighted average OP Units outstanding — basic and diluted | 183,279 |  |  | 183,279 |  |  | 184,196 |
Income/(loss) per weighted average OP Unit — basic and diluted: |  |  |  |  |
Income/(loss) from continuing operations attributable to OP unitholders | $ | 1.16 |  |  | $ | 0.53 |  |  | $ | 0.16 |
Income/(loss) from discontinued operations attributable to OP unitholders | — |  |  | — |  |  | 0.24 |
Net income/(loss) attributable to OP unitholders | $ | 1.16 |  |  | $ | 0.53 |  |  | $ | 0.40 |

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