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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Total Amkor Stockholders’ Equity | Common Stock | Additional Paid- In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Noncontrolling Interest in Subsidiaries
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period, common stock (in shares) at Dec. 31, 2020 |  |  | 288,923 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2020 | $ 2,353,959 | $ 2,325,699 | $ 289 | $ 1,953,378 | $ 562,502 | $ 27,270 | $ (217,740) | $ 28,260
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2020 |  |  |  |  |  |  | (46,094) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 645,607 | 642,995 |  |  | 642,995 |  |  | 2,612
Other comprehensive income (loss) | (7,292) | (7,292) |  |  |  | (7,292) |  |
Treasury stock acquired through surrender of shares for tax withholding (in shares) |  |  |  |  |  |  | (57) |
Treasury stock acquired through surrender of shares for tax withholding | (1,325) | (1,325) |  |  |  |  | $ (1,325) |
Issuance of stock through share-based compensation plans (in shares) |  |  | 1,543 |  |  |  |  |
Issuance of stock through share-based compensation plans | 12,787 | 12,787 | $ 1 | 12,786 |  |  |  |
Share-based compensation | 10,970 | 10,970 |  | 10,970 |  |  |  |
Cash dividends declared | (41,558) | (41,558) |  |  | (41,558) |  |  |
Subsidiary dividends to noncontrolling interests | (602) |  |  |  |  |  |  | (602)
Balance at end of period, common stock (in shares) at Dec. 31, 2021 |  |  | 290,466 |  |  |  |  |
Balance at end of period at Dec. 31, 2021 | 2,972,546 | 2,942,276 | $ 290 | 1,977,134 | 1,163,939 | 19,978 | $ (219,065) | 30,270
Balance at end of period, treasury stock (in shares) at Dec. 31, 2021 |  |  |  |  |  |  | (46,151) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 767,042 | 765,823 |  |  | 765,823 |  |  | 1,219
Other comprehensive income (loss) | (3,279) | (3,279) |  |  |  | (3,279) |  |
Treasury stock acquired through surrender of shares for tax withholding (in shares) |  |  |  |  |  |  | (7) |
Treasury stock acquired through surrender of shares for tax withholding | (161) | (161) |  |  |  |  | $ (161) |
Issuance of stock through share-based compensation plans (in shares) |  |  | 783 |  |  |  |  |
Issuance of stock through share-based compensation plans | 5,649 | 5,649 | $ 1 | 5,648 |  |  |  |
Share-based compensation | 13,562 | 13,562 |  | 13,562 |  |  |  |
Cash dividends declared | (55,118) | (55,118) |  |  | (55,118) |  |  |
Subsidiary dividends to noncontrolling interests | $ (540) |  |  |  |  |  |  | (540)
Balance at end of period, common stock (in shares) at Dec. 31, 2022 | 291,249 |  | 291,249 |  |  |  |  |
Balance at end of period at Dec. 31, 2022 | $ 3,699,701 | 3,668,752 | $ 291 | 1,996,344 | 1,874,644 | 16,699 | $ (219,226) | 30,949
Balance at end of period, treasury stock (in shares) at Dec. 31, 2022 | (46,158) |  |  |  |  |  | (46,158) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | $ 362,131 | 359,813 |  |  | 359,813 |  |  | 2,318
Other comprehensive income (loss) | (349) | (349) |  |  |  | (349) |  |
Treasury stock acquired through surrender of shares for tax withholding (in shares) |  |  |  |  |  |  | (121) |
Treasury stock acquired through surrender of shares for tax withholding | (3,109) | (3,109) |  |  |  |  | $ (3,109) |
Issuance of stock through share-based compensation plans (in shares) |  |  | 918 |  |  |  |  |
Issuance of stock through share-based compensation plans | 3,550 | 3,550 | $ 1 | 3,549 |  |  |  |
Share-based compensation | 8,277 | 8,277 |  | 8,277 |  |  |  |
Cash dividends declared | (74,626) | (74,626) |  |  | (74,626) |  |  |
Subsidiary dividends to noncontrolling interests | $ (540) |  |  |  |  |  |  | (540)
Balance at end of period, common stock (in shares) at Dec. 31, 2023 | 292,167 |  | 292,167 |  |  |  |  |
Balance at end of period at Dec. 31, 2023 | $ 3,995,035 | $ 3,962,308 | $ 292 | $ 2,008,170 | $ 2,159,831 | $ 16,350 | $ (222,335) | $ 32,727
Balance at end of period, treasury stock (in shares) at Dec. 31, 2023 | (46,279) |  |  |  |  |  | (46,279) |

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