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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Numerator: |  |  |  |
Net loss attributable to ATN International, Inc. stockholders- Basic | $ 4,343 | $ (32,691) | $ (11,611) | $ (30,000)
Less: Preferred dividends | (1,558) | (1,426) | (4,523) | (4,154)
Net loss attributable to ATN International, Inc. common stockholders- Diluted | $ 2,785 | $ (34,117) | $ (16,134) | $ (34,154)
Denominator: |  |  |  |
Weighted-average shares outstanding- Basic | 15,257 | 15,114 | 15,204 | 15,268
Weighted-average shares outstanding- Diluted | 15,267 | 15,114 | 15,204 | 15,268

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