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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Numerator: |  |  |  |
Net loss attributable to ATN International, Inc. stockholders- Basic | $ (3,584) | $ (2,783) | $ (8,702) | $ (4,255)
Less: Preferred dividends | (1,303) | (1,192) | (3,593) | (3,462)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted | $ (4,887) | $ (3,975) | $ (12,295) | $ (7,717)
Denominator: |  |  |  |
Weighted-average shares outstanding- Basic | 15,601 | 15,763 | 15,666 | 15,746
Weighted-average shares outstanding- Diluted | 15,601 | 15,763 | 15,666 | 15,746

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