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ACQUISITIONS AND DISPOSITIONS - Unaudited pro forma operating results (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
ACQUISITIONS AND DISPOSITIONS        
Amount of pre-Close debt, and associated interest removed from pro forma results $ 164,600 $ 164,600 $ 164,600 $ 164,600
Transaction debt included in pro forma results 220,000 220,000 220,000 220,000
Revenue 166,760 111,739 415,135 331,743
Net Income attributable to ATN International, Inc. Stockholders $ (2,619) $ 2,661 $ 2,103 $ 6,393
Earnings Per Share        
Basic (in dollars per share) $ (0.22) $ 0.17 $ 0.08 $ 0.40
Diluted (in dollars per share) $ (0.22) $ 0.17 $ 0.08 $ 0.40
Pro Forma        
Revenue $ 180,148 $ 171,981 $ 550,290 $ 509,163
Net income attributable to ATN International, Inc. Stockholders 5,715 1,011 7,135 (11,922)
Unaudited pro forma adjustments $ 8,300 $ (1,600) $ 5,000 (18,300)
Transaction related costs       $ 25,100
Earnings Per Share        
Basic (in dollars per share) $ 0.28 $ (0.01) $ 0.22 $ (0.96)
Diluted (in dollars per share) $ 0.28 $ (0.01) $ 0.22 $ (0.96)