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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net loss attributable to ATN International, Inc. stockholders- Basic	$ (6,315)	$ (5,885)
Less: Preferred dividends	(1,348)	(1,045)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted	$ (7,663)	$ (6,930)
Denominator:
Weighted-average shares outstanding- Basic	15,437	15,768
Weighted-average shares outstanding- Diluted	15,437	15,768

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