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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator:
Net income (loss) attributable to ATN International, Inc. stockholders- Basic	$ 9,003	$ 767	$ 2,690	$ (5,118)
Less: Preferred dividends	(1,376)	(1,260)	(2,727)	(2,306)
Net income (loss) attributable to ATN International, Inc. common stockholders- Diluted	$ 7,627	$ (493)	$ (37)	$ (7,424)
Denominator:
Weighted-average shares outstanding- Basic	15,254	15,719	15,346	15,726
Weighted-average shares outstanding- Diluted	15,255	15,719	15,346	15,726

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