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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands | Total ATNI Stockholders' Equity | Common Stock | Treasury Stock, at cost | Additional Paid In Capital | Retained Earnings | Accumulated Other Comprehensive Income/(Loss) | Non-Controlling Interests | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2017 | $ 688,727 | $ 170 | $ (36,110) | $ 167,973 | $ 552,948 | $ 3,746 | $ 141,496 | $ 830,223
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Issuance of 12,500 shares of common stock upon exercise of stock options for the quarter ended March 31,2018 | 498 |  |  | 498 |  |  |  | 498
Purchase of common stock (28,242 and 41,827 shares) upon exercise of stock options for the quarter ended March 31, 2019 and 2018 respectively) | (2,538) |  | (2,538) |  |  |  |  | (2,538)
Stock-based compensation | 1,576 |  |  | 1,576 |  |  |  | 1,576
Dividends declared on common stock | (2,696) |  |  |  | (2,696) |  | (12,484) | (15,180)
Repurchase of non-controlling interests |  |  |  |  |  |  | (3) | (3)
Comprehensive income: |  |  |  |  |  |  |  |
Net income (loss) | (5,555) |  |  |  | (5,555) |  | 3,252 | (2,303)
Other comprehensive loss | (893) |  |  |  |  | (893) |  | (893)
Comprehensive income (loss) | (6,448) |  |  |  |  |  | 3,252 | (3,196)
Balance, end of period at Mar. 31, 2018 | 680,607 | 170 | (38,648) | 170,047 | 546,388 | 2,650 | 133,408 | 814,015
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Cumulative effect adjustment due to adoption of new accounting | 1,488 |  |  |  | 1,691 | (203) | 1,147 | 2,635
Balance, beginning of period at Dec. 31, 2018 | 695,387 | 172 | (48,547) | 181,778 | 563,593 | (1,609) | 127,937 | 823,324
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Purchase of common stock (28,242 and 41,827 shares) upon exercise of stock options for the quarter ended March 31, 2019 and 2018 respectively) | (1,569) |  | (1,569) |  |  |  |  | (1,569)
Stock-based compensation | 1,301 |  |  | 1,301 |  |  |  | 1,301
Dividends declared on common stock | (2,693) |  |  |  | (2,693) |  | (1,553) | (4,246)
Repurchase of non-controlling interests |  |  |  |  |  |  | (225) | (225)
Investments made by minority shareholders in consolidated affiliates |  |  |  |  |  |  | 488 | 488
Comprehensive income: |  |  |  |  |  |  |  |
Net income (loss) | (1,581) |  |  |  | (1,581) |  | 2,316 | 735
Other comprehensive loss | 176 |  |  |  |  | 176 |  | 176
Comprehensive income (loss) | (1,405) |  |  |  |  |  | 2,316 | 911
Balance, end of period at Mar. 31, 2019 | $ 691,021 | $ 172 | $ (50,116) | $ 183,079 | $ 559,319 | $ (1,433) | $ 128,963 | $ 819,984

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