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CONDENSED 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, 2018 | $ 695,387 | $ 172 | $ (48,547) | $ 181,778 | $ 563,593 | $ (1,609) | $ 127,937 | $ 823,324
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Issuance of shares of common stock upon exercise of stock options | 62 |  |  | 62 |  |  |  | 62
Purchase of shares of common stock | (1,837) |  | (1,837) |  |  |  |  | (1,837)
Stock-based compensation | 4,606 |  |  | 4,606 |  |  | 275 | 4,881
Dividends declared on common stock | (8,178) |  |  |  | (8,178) |  | (5,788) | (13,966)
Repurchase of non-controlling interests |  |  |  |  |  |  | (1,353) | (1,353)
Investments made by minority shareholders in consolidated affiliates |  |  |  |  |  |  | 488 | 488
Comprehensive income: |  |  |  |  |  |  |  |
Net income (loss) | (1,052) |  |  |  | (1,052) |  | 8,657 | 7,605
Other comprehensive income (loss) | (905) |  |  |  |  | (905) |  | (905)
Comprehensive income (loss) | (1,957) |  |  |  |  |  | 8,657 | 6,700
Balance, end of period at Sep. 30, 2019 | 688,083 | 172 | (50,384) | 186,446 | 554,363 | (2,514) | 130,216 | 818,299
Balance, beginning of period at Jun. 30, 2019 | 689,683 | 172 | (50,125) | 185,112 | 555,806 | (1,282) | 128,858 | 818,541
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Issuance of shares of common stock upon exercise of stock options | 62 |  |  | 62 |  |  |  | 62
Purchase of shares of common stock | (259) |  | (259) |  |  |  |  | (259)
Stock-based compensation | 1,272 |  |  | 1,272 |  |  | 275 | 1,547
Dividends declared on common stock | (2,828) |  |  |  | (2,828) |  | (1,885) | (4,713)
Repurchase of non-controlling interests |  |  |  |  |  |  | (491) | (491)
Comprehensive income: |  |  |  |  |  |  |  |
Net income (loss) | 1,385 |  |  |  | 1,385 |  | 3,459 | 4,844
Other comprehensive income (loss) | (1,232) |  |  |  |  | (1,232) |  | (1,232)
Comprehensive income (loss) | 153 |  |  |  |  |  | 3,459 | 3,612
Balance, end of period at Sep. 30, 2019 | 688,083 | 172 | (50,384) | 186,446 | 554,363 | (2,514) | 130,216 | 818,299
Balance, beginning of period at Dec. 31, 2019 | 676,122 | 172 | (51,129) | 188,471 | 541,890 | (3,282) | 129,961 | 806,083
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Purchase of shares of common stock | (8,327) |  | (8,327) |  |  |  |  | (8,327)
Stock-based compensation | 4,419 |  |  | 4,419 |  |  | 189 | 4,608
Dividends declared on common stock | (8,164) |  |  |  | (8,164) |  | (6,514) | (14,678)
Repurchase of non-controlling interests | (1,312) |  |  | (1,312) |  |  | (7,451) | (8,763)
Comprehensive income: |  |  |  |  |  |  |  |
Net income (loss) | 6,393 |  |  |  | 6,393 |  | 10,538 | 16,931
Other comprehensive income (loss) | (1,256) |  |  |  |  | (1,256) |  | (1,256)
Comprehensive income (loss) | 5,137 |  |  |  |  |  | 10,538 | 15,675
Balance, end of period at Sep. 30, 2020 | 667,875 | 172 | (59,456) | 191,578 | 540,119 | (4,538) | 126,723 | 794,598
Balance, beginning of period at Jun. 30, 2020 | 668,730 | 172 | (55,316) | 189,785 | 540,183 | (6,094) | 128,913 | 797,643
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Purchase of shares of common stock | (4,140) |  | (4,140) |  |  |  |  | (4,140)
Stock-based compensation | 1,793 |  |  | 1,793 |  |  | 94 | 1,887
Dividends declared on common stock | (2,725) |  |  |  | (2,725) |  | (962) | (3,687)
Repurchase of non-controlling interests |  |  |  |  |  |  | (4,852) | (4,852)
Comprehensive income: |  |  |  |  |  |  |  |
Net income (loss) | 2,661 |  |  |  | 2,661 |  | 3,530 | 6,191
Other comprehensive income (loss) | 1,556 |  |  |  |  | 1,556 |  | 1,556
Comprehensive income (loss) | 4,217 |  |  |  |  |  | 3,530 | 7,747
Balance, end of period at Sep. 30, 2020 | $ 667,875 | $ 172 | $ (59,456) | $ 191,578 | $ 540,119 | $ (4,538) | $ 126,723 | $ 794,598

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