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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Numerator: |  |  |  |
Net income (loss) attributable to ATN International, Inc. stockholders- Basic | $ 9,003 | $ 767 | $ 2,690 | $ (5,118)
Less: Preferred dividends | (1,376) | (1,260) | (2,727) | (2,306)
Net income (loss) attributable to ATN International, Inc. common stockholders- Diluted | $ 7,627 | $ (493) | $ (37) | $ (7,424)
Denominator: |  |  |  |
Weighted-average shares outstanding- Basic | 15,254 | 15,719 | 15,346 | 15,726
Weighted-average shares outstanding- Diluted | 15,255 | 15,719 | 15,346 | 15,726

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