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EARNINGS PER SHARE AND REDEEMABLE NONCONTROLLING INTERESTS - Computation of basic and diluted earnings per share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income $ (4,475) $ 6,191 $ 3,089 $ 16,931
Net (income) loss attributable to noncontrolling interests 1,856 (3,530) (986) (10,538)
NET INCOME (LOSS) ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS (2,619) 2,661 2,103 6,393
Less: Accrued preferred dividend 846   846  
Net income (loss) attributable to ATN International, Inc. stockholders- Diluted $ (3,465) $ 2,661 $ 1,257 $ 6,393
Denominator:        
Weighted-average shares outstanding- Basic 15,860 15,962 15,891 15,946
Stock options, restricted stock units and performance stock units   49 10 44
Weighted-average shares outstanding- Diluted 15,860 16,011 15,901 15,990