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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Numerator: |  |  |  |
Net income (loss) attributable to ATN International, Inc. stockholders- Basic | $ 767 | $ (525) | $ (5,118) | $ (1,471)
Less: Preferred dividends | (1,260) | (1,154) | (2,306) | (2,270)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted | $ (493) | $ (1,679) | $ (7,424) | $ (3,741)
Denominator: |  |  |  |
Weighted-average shares outstanding- Basic | 15,719 | 15,749 | 15,726 | 15,736
Weighted-average shares outstanding- Diluted | 15,719 | 15,749 | 15,726 | 15,736

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