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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net loss attributable to ATN International, Inc. stockholders- Basic	$ (8,928)	$ (6,315)
Less: Preferred dividends	(1,458)	(1,348)
Net loss attributable to ATN International, Inc. common stockholders- Diluted	$ (10,386)	$ (7,663)
Denominator:
Weighted-average shares outstanding- Basic	15,131	15,437
Weighted-average shares outstanding- Diluted	15,131	15,437

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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