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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Numerator: |  |  |  |
Net income (loss) attributable to ATN International, Inc. stockholders- Basic | $ (32,691) | $ (3,584) | $ (30,000) | $ (8,702)
Less: Preferred dividends | (1,426) | (1,303) | (4,154) | (3,593)
Net income (loss) attributable to ATN International, Inc. common stockholders- Diluted | $ (34,117) | $ (4,887) | $ (34,154) | $ (12,295)
Denominator: |  |  |  |
Weighted-average shares outstanding- Basic | 15,114 | 15,601 | 15,268 | 15,666
Weighted-average shares outstanding- Diluted | 15,114 | 15,601 | 15,268 | 15,666

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