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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL - Earnings Per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Basic and diluted earnings per common share |  |  |  |  |  |  |
Net income (loss) | $ 50,366 |  | $ 38,932 |  | $ 93,681 | $ 77,249 |
Noncontrolling interests in the Operating Partnership | (1,768) |  | (389) |  | (3,317) | (772) |
Noncontrolling interest in subsidiaries | 154 |  | (38) |  | 120 | (76) |
NET INCOME ATTRIBUTABLE TO THE COMPANY'S COMMON SHAREHOLDERS | $ 48,752 |  | $ 38,505 |  | $ 90,484 | $ 76,401 |
Weighted average basic shares outstanding (in shares) | 201,414,000 |  | 193,629,000 |  | 200,293,000 | 193,605,000 |
Share options and restricted share units (in shares) | 1,395,000 |  | 563,000 |  | 1,234,000 | 626,000 |
Weighted-average diluted shares outstanding (in shares) | 202,809,000 |  | 194,192,000 |  | 201,527,000 | 194,231,000 |
Basic earnings per share attributable to common shareholders (in dollars per share) | $ 0.24 |  | $ 0.20 |  | $ 0.45 | $ 0.39 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.24 |  | $ 0.20 |  | $ 0.45 | $ 0.39 |
Basic and diluted earnings per common unit |  |  |  |  |  |  |
Noncontrolling interests in the Operating Partnership | $ (1,768) |  | $ (389) |  | $ (3,317) | $ (772) |
Weighted average basic shares outstanding (in shares) | 201,414,000 |  | 193,629,000 |  | 200,293,000 | 193,605,000 |
Share options and restricted share units (in shares) | 1,395,000 |  | 563,000 |  | 1,234,000 | 626,000 |
Weighted average diluted shares outstanding (in shares) | 202,809,000 |  | 194,192,000 |  | 201,527,000 | 194,231,000 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.24 |  | $ 0.20 |  | $ 0.45 | $ 0.39 |
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares) | 0 |  | 1,300,000 |  | 0 | 1,100,000 |
Common stock, cash dividends declared (in dollars per share) | $ 0.34 | $ 0.34 | $ 0.33 | $ 0.33 | $ 0.68 | $ 0.66 |
Outstanding units of noncontrolling interest in the Operating Partnership (in shares) | 7,284,506 |  | 1,872,308 |  | 7,284,506 | 1,872,308 |
Common shares, shares outstanding | 201,768,903 |  | 193,728,951 |  | 201,768,903 | 193,728,951 | 197,405,989
Cubesmart, L P and Subsidiaries |  |  |  |  |  |  |
Basic and diluted earnings per common share |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | $ 93,681 | $ 77,249 |
Noncontrolling interests in the Operating Partnership | $ (1,768) |  | $ (389) |  | $ (3,317) | $ (772) |
Weighted average basic shares outstanding (in shares) | 201,414,000 |  | 193,629,000 |  | 200,293,000 | 193,605,000 |
Share options and restricted share units (in shares) | 1,395,000 |  | 563,000 |  | 1,234,000 | 626,000 |
Weighted-average diluted shares outstanding (in shares) | 202,809,000 |  | 194,192,000 |  | 201,527,000 | 194,231,000 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.24 |  | $ 0.20 |  | $ 0.45 | $ 0.39 |
Basic and diluted earnings per common unit |  |  |  |  |  |  |
Net Income | $ 50,366 |  | $ 38,932 |  | $ 93,681 | $ 77,249 |
Noncontrolling interests in the Operating Partnership | (1,768) |  | (389) |  | (3,317) | (772) |
Noncontrolling interest in subsidiaries | 154 |  | (38) |  | 120 | (76) |
Net income attributable to common unitholders | $ 48,752 |  | $ 38,505 |  | $ 90,484 | $ 76,401 |
Weighted average basic shares outstanding (in shares) | 201,414,000 |  | 193,629,000 |  | 200,293,000 | 193,605,000 |
Share options and restricted share units (in shares) | 1,395,000 |  | 563,000 |  | 1,234,000 | 626,000 |
Weighted average diluted shares outstanding (in shares) | 202,809,000 |  | 194,192,000 |  | 201,527,000 | 194,231,000 |
Basic earnings per unit attributable to common unitholders | $ 0.24 |  | $ 0.20 |  | $ 0.45 | $ 0.39 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.24 |  | $ 0.20 |  | $ 0.45 | $ 0.39 |

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