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Revenue Recognition - Impacts of adoption in the current period - IS (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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 OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 451,207 |  |
Sales, marketing and customer service |  |  |  |  |  |  |  |  | 35,207 | $ 35,184 | $ 30,253
Total operating expenses | $ 97,488 | $ 90,395 | $ 102,035 | $ 100,266 | $ 66,387 | $ 141,697 | $ 107,442 | $ 110,359 | 390,184 | 425,885 | 405,733
Income from operations | 10,318 | 30,743 | 15,753 | 4,209 | 41,314 | (19,565) | 15,803 | 17,756 | 61,023 | 55,308 | 51,270
Income before taxes | 11,336 | 27,920 | 12,868 | 1,618 | 41,196 | (21,860) | 13,505 | 14,712 | 53,742 | 47,553 | 45,374
Income tax provisions (benefit) | 5,851 | 7,010 | 2,088 | 3,921 | (6,181) | (884) | 2,596 | 3,128 | 18,870 | (1,341) | 21,160
Net income | 5,485 | 20,910 | 10,780 | (2,303) | 47,377 | (20,976) | 10,909 | 11,584 | 34,872 | 48,894 | 24,214
Net income attributable to non-controlling interests, net of tax | (4,354) | (3,887) | (3,564) | (3,252) | (3,871) | (3,784) | (5,026) | (4,725) | (15,057) | (17,406) | (12,113)
Net income attributable to ATN International, Inc. stockholders | $ 1,131 | $ 17,023 | $ 7,216 | $ (5,555) | $ 43,506 | $ (24,760) | $ 5,883 | $ 6,859 | 19,815 | $ 31,488 | $ 12,101
ASU 2014-09 | Change |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,075 |  |
Sales, marketing and customer service |  |  |  |  |  |  |  |  | (755) |  |
Total operating expenses |  |  |  |  |  |  |  |  | (755) |  |
Income from operations |  |  |  |  |  |  |  |  | 1,830 |  |
Income before taxes |  |  |  |  |  |  |  |  | 1,830 |  |
Income tax provisions (benefit) |  |  |  |  |  |  |  |  | 131 |  |
Net income |  |  |  |  |  |  |  |  | 1,699 |  |
Net income attributable to non-controlling interests, net of tax |  |  |  |  |  |  |  |  | (706) |  |
Net income attributable to ATN International, Inc. stockholders |  |  |  |  |  |  |  |  | 993 |  |
ASU 2014-09 | Under previous guidance |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 450,132 |  |
Sales, marketing and customer service |  |  |  |  |  |  |  |  | 35,962 |  |
Total operating expenses |  |  |  |  |  |  |  |  | 390,939 |  |
Income from operations |  |  |  |  |  |  |  |  | 59,193 |  |
Income before taxes |  |  |  |  |  |  |  |  | 51,912 |  |
Income tax provisions (benefit) |  |  |  |  |  |  |  |  | 18,739 |  |
Net income |  |  |  |  |  |  |  |  | 33,173 |  |
Net income attributable to non-controlling interests, net of tax |  |  |  |  |  |  |  |  | (14,351) |  |
Net income attributable to ATN International, Inc. stockholders |  |  |  |  |  |  |  |  | 18,822 |  |
Wireless |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 198,824 |  |
Wireless | ASU 2014-09 | Change |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,075 |  |
Wireless | ASU 2014-09 | Under previous guidance |  |  |  |  |  |  |  |  |  |  |
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 197,749 |  |

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