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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - 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, 2021 |  |  | 290,466 |  |  |  |  |
Balance at beginning 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 beginning of period, treasury stock (in shares) at Jun. 30, 2022 |  |  |  |  |  |  | (46,155) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 296,697 | 295,441 |  |  | 295,441 |  |  | 1,256
Other comprehensive income (loss) | (25,725) | (25,725) |  |  |  | (25,725) |  |
Treasury stock acquired through surrender of shares for tax withholding (in shares) |  |  |  |  |  |  | (4) |
Treasury stock acquired through surrender of shares for tax withholding | (82) | (82) |  |  |  |  | $ (82) |
Issuance of stock through share-based compensation plans (in shares) |  |  | 322 |  |  |  |  |
Issuance of stock through share-based compensation plans | 1,740 | 1,740 | $ 1 | 1,739 |  |  |  |
Share-based compensation | 7,119 | 7,119 |  | 7,119 |  |  |  |
Cash dividends declared | (24,474) | (24,474) |  |  | (24,474) |  |  |
Subsidiary dividends to non-controlling interests | (271) |  |  |  |  |  |  | (271)
Balance at end of period, common stock (in shares) at Jun. 30, 2022 |  |  | 290,788 |  |  |  |  |
Balance at end of period at Jun. 30, 2022 | 3,227,550 | 3,196,295 | $ 291 | 1,985,992 | 1,434,906 | (5,747) | $ (219,147) | 31,255
Balance at end of period, treasury stock (in shares) at Dec. 31, 2021 |  |  |  |  |  |  | (46,151) |
Balance at beginning of period, common stock (in shares) at Mar. 31, 2022 |  |  | 290,687 |  |  |  |  |
Balance at beginning of period at Mar. 31, 2022 | 3,126,822 | 3,096,123 | $ 291 | 1,982,113 | 1,322,370 | 10,496 | $ (219,147) | 30,699
Balance at beginning of period, treasury stock (in shares) at Jun. 30, 2022 |  |  |  |  |  |  | (46,155) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 125,469 | 124,778 |  |  | 124,778 |  |  | 691
Other comprehensive income (loss) | (16,243) | (16,243) |  |  |  | (16,243) |  |
Issuance of stock through share-based compensation plans (in shares) |  |  | 101 |  |  |  |  |
Issuance of stock through share-based compensation plans | 258 | 258 |  | 258 |  |  |  |
Share-based compensation | 3,621 | 3,621 |  | 3,621 |  |  |  |
Cash dividends declared | (12,242) | (12,242) |  |  | (12,242) |  |  |
Subsidiary dividends to non-controlling interests | (135) |  |  |  |  |  |  | (135)
Balance at end of period, common stock (in shares) at Jun. 30, 2022 |  |  | 290,788 |  |  |  |  |
Balance at end of period at Jun. 30, 2022 | $ 3,227,550 | 3,196,295 | $ 291 | 1,985,992 | 1,434,906 | (5,747) | $ (219,147) | 31,255
Balance at end of period, treasury stock (in shares) at Mar. 31, 2022 |  |  |  |  |  |  | (46,155) |
Balance at beginning of period, common stock (in shares) at Dec. 31, 2022 | 245,091 |  | 291,249 |  |  |  |  |
Balance at beginning 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 beginning of period, treasury stock (in shares) at Jun. 30, 2023 | (46,269) |  |  |  |  |  | (46,269) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | $ 109,668 | 109,637 |  |  | 109,637 |  |  | 31
Other comprehensive income (loss) | (15,267) | (15,267) |  |  |  | (15,267) |  |
Treasury stock acquired through surrender of shares for tax withholding (in shares) |  |  |  |  |  |  | (111) |
Treasury stock acquired through surrender of shares for tax withholding | (2,823) | (2,823) |  |  |  |  | $ (2,823) |
Issuance of stock through share-based compensation plans (in shares) |  |  | 709 |  |  |  |  |
Issuance of stock through share-based compensation plans | 1,925 | 1,925 | $ 1 | 1,924 |  |  |  |
Share-based compensation | 6,787 | 6,787 |  | 6,787 |  |  |  |
Cash dividends declared | (36,861) | (36,861) |  |  | (36,861) |  |  |
Subsidiary dividends to non-controlling interests | $ (271) |  |  |  |  |  |  | (271)
Balance at end of period, common stock (in shares) at Jun. 30, 2023 | 245,689 |  | 291,958 |  |  |  |  |
Balance at end of period at Jun. 30, 2023 | $ 3,762,859 | 3,732,150 | $ 292 | 2,005,055 | 1,947,420 | 1,432 | $ (222,049) | 30,709
Balance at end of period, treasury stock (in shares) at Dec. 31, 2022 | (46,158) |  |  |  |  |  | (46,158) |
Balance at beginning of period, common stock (in shares) at Mar. 31, 2023 |  |  | 291,814 |  |  |  |  |
Balance at beginning of period at Mar. 31, 2023 | $ 3,727,163 | 3,696,477 | $ 292 | 2,001,575 | 1,901,569 | 15,090 | $ (222,049) | 30,686
Balance at beginning of period, treasury stock (in shares) at Jun. 30, 2023 | (46,269) |  |  |  |  |  | (46,269) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | $ 64,444 | 64,286 |  |  | 64,286 |  |  | 158
Other comprehensive income (loss) | (13,658) | (13,658) |  |  |  | (13,658) |  |
Issuance of stock through share-based compensation plans (in shares) |  |  | 144 |  |  |  |  |
Issuance of stock through share-based compensation plans | 401 | 401 |  | 401 |  |  |  |
Share-based compensation | 3,079 | 3,079 |  | 3,079 |  |  |  |
Cash dividends declared | (18,435) | (18,435) |  |  | (18,435) |  |  |
Subsidiary dividends to non-controlling interests | $ (135) |  |  |  |  |  |  | (135)
Balance at end of period, common stock (in shares) at Jun. 30, 2023 | 245,689 |  | 291,958 |  |  |  |  |
Balance at end of period at Jun. 30, 2023 | $ 3,762,859 | $ 3,732,150 | $ 292 | $ 2,005,055 | $ 1,947,420 | $ 1,432 | $ (222,049) | $ 30,709
Balance at end of period, treasury stock (in shares) at Mar. 31, 2023 |  |  |  |  |  |  | (46,269) |

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