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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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
Net loss attributable to ATN International, Inc. stockholders- Basic	$ (7,026)	$ 9,003	$ (15,954)	$ 2,690
Less: Preferred dividends	(1,507)	(1,376)	(2,965)	(2,727)
Net loss attributable to ATN International, Inc. common stockholders- Diluted	$ (8,533)	$ 7,627	$ (18,919)	$ (37)
Denominator:
Weighted-average shares outstanding- Basic	15,223	15,254	15,177	15,346
Weighted-average shares outstanding- Diluted	15,223	15,255	15,177	15,346

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