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Revenue Recognition - Impacts of adoption in the current period - CIS (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |
Net income | $ 5,485 | $ 20,910 | $ 10,780 | $ (2,303) | $ 47,377 | $ (20,976) | $ 10,909 | $ 11,584 | $ 34,872 | $ 48,894 | $ 24,214
Other comprehensive loss, net of tax |  |  |  |  |  |  |  |  | (5,152) | 2,018 | 5,432
Comprehensive income |  |  |  |  |  |  |  |  | 29,720 | 50,912 | 29,646
Less: Comprehensive income attributable to non-controlling interests |  |  |  |  |  |  |  |  | (15,057) | (17,406) | (12,113)
Comprehensive income attributable to ATN International, Inc. |  |  |  |  |  |  |  |  | 14,663 | $ 33,506 | $ 17,533
ASU 2014-09 | Change |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 1,699 |  |
Comprehensive income |  |  |  |  |  |  |  |  | 1,699 |  |
Less: Comprehensive income attributable to non-controlling interests |  |  |  |  |  |  |  |  | (706) |  |
Comprehensive income attributable to ATN International, Inc. |  |  |  |  |  |  |  |  | 993 |  |
ASU 2014-09 | Under previous guidance |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 33,173 |  |
Other comprehensive loss, net of tax |  |  |  |  |  |  |  |  | (5,152) |  |
Comprehensive income |  |  |  |  |  |  |  |  | 28,021 |  |
Less: Comprehensive income attributable to non-controlling interests |  |  |  |  |  |  |  |  | (14,351) |  |
Comprehensive income attributable to ATN International, Inc. |  |  |  |  |  |  |  |  | $ 13,670 |  |

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