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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net loss attributable to ATN International, Inc. stockholders- Basic	$ (3,584)	$ (2,783)	$ (8,702)	$ (4,255)
Less: Preferred dividends	(1,303)	(1,192)	(3,593)	(3,462)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted	$ (4,887)	$ (3,975)	$ (12,295)	$ (7,717)
Denominator:
Weighted-average shares outstanding- Basic	15,601	15,763	15,666	15,746
Weighted-average shares outstanding- Diluted	15,601	15,763	15,666	15,746

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