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INCOME/(LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Jul. 31, 2017
Antidilutive securities |  |  |  |  |  |  |  |
Net income/(loss) |  |  | $ 12,535 | $ 62,096 | $ 15,809 | $ 67,636 |  |
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership |  |  | (807) | (4,291) | (961) | (4,604) |  |
Net (income)/loss attributable to noncontrolling interests |  |  | (8) | (34) | (24) | (40) |  |
Net income/(loss) attributable to UDR, Inc. |  |  | 11,720 | 57,771 | 14,824 | 62,992 |  |
Distributions to preferred stockholders - Series E (Convertible) |  |  | (1,057) | (1,062) | (2,113) | (2,128) |  |
Net income/(loss) attributable to common stockholders |  |  | $ 10,663 | $ 56,709 | $ 12,711 | $ 60,864 |  |
Denominator for income/(loss) per share: |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 296,842,000 | 294,970,000 | 296,821,000 | 294,850,000 |  |
Non-vested restricted stock awards |  |  | (253,000) | (260,000) | (257,000) | (266,000) |  |
Denominator for basic income/(loss) per share |  |  | 296,589,000 | 294,710,000 | 296,564,000 | 294,584,000 |  |
Incremental shares issuable from assumed conversion of unvested LTIP Units and unvested restricted stock |  |  | 953,000 | 377,000 | 657,000 | 499,000 |  |
Denominator for diluted income/(loss) per share |  |  | 297,542,000 | 295,087,000 | 297,221,000 | 295,083,000 |  |
Income/(loss) per weighted average common share - basic |  |  | $ 0.04 | $ 0.19 | $ 0.04 | $ 0.21 |  |
Income/(loss) per weighted average common share - diluted |  |  | $ 0.04 | $ 0.19 | $ 0.04 | $ 0.21 |  |
Number of shares authorized | 350,000,000 |  | 350,000,000 |  | 350,000,000 |  | 350,000,000 |
Aggregate net proceeds from sales, after deducting related costs |  |  | $ (393) |  | $ (393) |  |  |
OP/DownREIT Units |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |
Antidilutive securities |  |  | 22,550,000 | 22,386,000 | 22,474,000 | 22,307,000 |  |
Convertible preferred stock |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |
Antidilutive securities |  |  | 2,918,000 | 2,953,000 | 2,918,000 | 2,982,000 |  |
Unvested LTIP Units and unvested restricted stock |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  |
Antidilutive securities |  |  | 953,000 | 377,000 | 657,000 | 499,000 |  |
ATM |  |  |  |  |  |  |  |
Denominator for income/(loss) per share: |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  | 20,000,000.0
Aggregate number of shares |  |  | 2,600,000 |  | 4,800,000 |  |  |
Weighted average price per share |  |  | $ 49.07 |  | $ 46.61 |  |  |
Shares of common stock available for future issuance | 9,600,000 |  | 9,600,000 |  | 9,600,000 |  |  |
Shares settled |  |  |  |  | 0 |  |  |
Forward Sales Agreement |  |  |  |  |  |  |  |
Denominator for income/(loss) per share: |  |  |  |  |  |  |  |
Forward price | $ 49.22 | $ 43.51 |  |  |  |  |  |
Shares of common stock available for future issuance | 6,100,000 | 7,000,000.0 | 6,100,000 |  | 6,100,000 |  |  |
Shares settled |  |  |  |  | 0 |  |  |

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