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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Numerator: |  |
Net loss attributable to ATN International, Inc. stockholders- Basic | $ (6,315) | $ (5,885)
Less: Preferred dividends | (1,348) | (1,045)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted | $ (7,663) | $ (6,930)
Denominator: |  |
Weighted-average shares outstanding- Basic | 15,437 | 15,768
Weighted-average shares outstanding- Diluted | 15,437 | 15,768

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