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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
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Numerator: |  |
Net loss attributable to ATN International, Inc. stockholders | $ (948) | $ 2,706
Less: Preferred dividends | (1,116) |
Net loss attributable to ATN International, Inc. common stockholders | $ (2,064) | $ 2,706
Denominator: |  |
Weighted-average shares outstanding- Basic | 15,708 | 15,902
Stock options, restricted stock units and performance stock units |  | 50
Weighted-average shares outstanding- Diluted | 15,708 | 15,952

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