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ACQUISITIONS AND DISPOSITIONS - Unaudited pro forma operating results (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
ACQUISITIONS AND DISPOSITIONS      
Amount of pre-Close debt, and associated interest removed from pro forma results   $ 164,600  
Transaction debt included in pro forma results   283,000  
Revenue $ 725,745 602,707 $ 455,444
Net loss attributable to ATN International, Inc. Stockholders $ (5,645) $ (22,108) $ (14,122)
Net income (loss) per weighted average basic share attributable to ATN International, Inc. stockholders      
Basic (in dollars per share) $ (0.67) $ (1.52) $ (0.89)
Diluted (in dollars per share) $ (0.67) $ (1.52) $ (0.89)
Pro Forma      
Revenue   $ 738,472  
Net loss attributable to ATN International, Inc. Stockholders   $ (20,022)  
Earnings Per Share      
Basic (in dollars per share)   $ (1.26)  
Diluted (in dollars per share)   $ (1.26)  
Unaudited pro forma adjustments increased net income   $ 2,100