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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Numerator: |  |  |  |
Net Income (loss) attributable to ATN International, Inc. Stockholders | $ (2,783) | $ (2,619) | $ (4,255) | $ 2,103
Less: Preferred dividends | 1,192 | 846 | 3,462 | 846
Net income (loss) attributable to ATN International, Inc. common stockholders | $ (3,975) | $ (3,465) | $ (7,717) | $ 1,257
Denominator: |  |  |  |
Weighted-average shares outstanding- Basic | 15,763 | 15,860 | 15,746 | 15,891
Stock options, restricted stock units and performance stock units |  |  |  | 10
Weighted-average shares outstanding- Diluted | 15,763 | 15,860 | 15,746 | 15,901

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