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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly financial data |  |  |  |  |  |  |  |  |  |  |
Total Revenue | $ 107,806 | $ 121,138 | $ 117,788 | $ 104,475 | $ 107,701 | $ 122,132 | $ 123,245 | $ 128,115 | $ 451,207 | $ 481,193 | $ 457,003
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
Other income (expense), net | 1,018 | (2,823) | (2,885) | (2,591) | (118) | (2,295) | (2,298) | (3,044) | (7,281) | (7,755) | (5,896)
INCOME BEFORE INCOME TAXES | 11,336 | 27,920 | 12,868 | 1,618 | 41,196 | (21,860) | 13,505 | 14,712 | 53,742 | 47,553 | 45,374
Income taxes | 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
Net income (loss) per weighted average basic share attributable to ATN International, Inc. stockholders |  |  |  |  |  |  |  |  |  |  |
Total (in dollars per share) | $ 0.07 | $ 1.07 | $ 0.45 | $ (0.35) | $ 2.71 | $ (1.53) | $ 0.36 | $ 0.42 | $ 1.24 | $ 1.95 | $ 0.75
Net income (loss) per weighted average diluted share attributable to ATN International, Inc. stockholders |  |  |  |  |  |  |  |  |  |  |
Total (in dollars per share) | $ 0.07 | $ 1.07 | $ 0.45 | $ (0.35) | $ 2.71 | $ (1.53) | $ 0.36 | $ 0.42 | $ 1.24 | $ 1.94 | $ 0.75

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