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EQUITY (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Stockholders' equity |  |
Equity, beginning of period | $ 830,223 | $ 809,169
Stock-based compensation | 1,576 | 1,666
Comprehensive income: |  |
Net income (loss) | (2,303) | 11,584
Projected pension benefit obligation, net of tax of $0 and $0.4 million |  | 513
Unrealized gain (loss) on securities | 139 | (41)
Reclassifications of gains on sale of marketable securities to net income |  | (289)
Foreign currency translation adjustment | (1,032) | 1,930
Comprehensive income (loss) | (3,196) | 13,697
Issuance of common stock upon exercise of stock options | 498 | 95
Dividends declared on common stock | (15,181) | (5,460)
Distributions to non-controlling interests |  | (2,888)
Investments made by non-controlling interests |  | 69
Loss on deconsolidation of subsidiary |  | 529
Repurchase of non-controlling interests | (2) | (819)
Purchase of treasury stock | (2,538) | (2,215)
Equity, end of period | 814,015 | 813,953
ASU 2016-09 |  |
Comprehensive income: |  |
Change in accounting method- adoption |  | 110
ASU 2014-09 |  |
Comprehensive income: |  |
Change in accounting method- adoption | 2,635 |
Total ATNI Stockholders' Equity |  |
Stockholders' equity |  |
Equity, beginning of period | 688,727 | 677,055
Stock-based compensation | 1,576 | 1,666
Comprehensive income: |  |
Net income (loss) | (5,555) | 6,859
Projected pension benefit obligation, net of tax of $0 and $0.4 million |  | 513
Unrealized gain (loss) on securities | 139 | (41)
Reclassifications of gains on sale of marketable securities to net income |  | (289)
Foreign currency translation adjustment | (1,032) | 1,930
Comprehensive income (loss) | (6,448) | 8,972
Issuance of common stock upon exercise of stock options | 498 | 95
Dividends declared on common stock | (2,696) | (5,460)
Repurchase of non-controlling interests |  | (670)
Purchase of treasury stock | (2,538) | (2,215)
Equity, end of period | 680,607 | 679,553
Total ATNI Stockholders' Equity | ASU 2016-09 |  |
Comprehensive income: |  |
Change in accounting method- adoption |  | 110
Total ATNI Stockholders' Equity | ASU 2014-09 |  |
Comprehensive income: |  |
Change in accounting method- adoption | 1,488 |
Non-Controlling Interests |  |
Stockholders' equity |  |
Equity, beginning of period | 141,496 | 132,114
Comprehensive income: |  |
Net income (loss) | 3,252 | 4,725
Comprehensive income (loss) | 3,252 | 4,725
Dividends declared on common stock | (12,485) |
Distributions to non-controlling interests |  | (2,888)
Investments made by non-controlling interests |  | 69
Loss on deconsolidation of subsidiary |  | 529
Repurchase of non-controlling interests | (2) | (149)
Equity, end of period | 133,408 | $ 136,134
Non-Controlling Interests | ASU 2014-09 |  |
Comprehensive income: |  |
Change in accounting method- adoption | $ 1,147 |

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