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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net Loss attributable to ATN International, Inc. stockholders- Basic	$ (5,885)	$ (948)
Less: Preferred dividends	(1,045)	(1,116)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted	$ (6,930)	$ (2,064)
Denominator:
Weighted-average shares outstanding- Basic	15,768	15,708
Weighted-average shares outstanding- Diluted	15,768	15,708

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