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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Numerator: |  |
Net Loss attributable to ATN International, Inc. stockholders- Basic | $ (5,885) | $ (948)
Less: Preferred dividends | (1,045) | (1,116)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted | $ (6,930) | $ (2,064)
Denominator: |  |
Weighted-average shares outstanding- Basic | 15,768 | 15,708
Weighted-average shares outstanding- Diluted | 15,768 | 15,708

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