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Financial Instruments - Currency risk (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
NTD | Financial liabilities |  |
Statement [line items] |  |
Foreign currency | $ 1,246,126 | $ 1,422,137
Exchange rate | 32.785 | 30.705
Functional currency | $ 38,010 | $ 46,315
NTD | Financial assets |  |
Statement [line items] |  |
Foreign currency | $ 235,638 | $ 281,550
Exchange rate | 32.785 | 30.705
Functional currency | $ 7,187 | $ 9,170
CNY | Financial assets |  |
Statement [line items] |  |
Foreign currency | $ 38,575 | $ 38,528
Exchange rate | 7.1884 | 7.0972
Functional currency | $ 5,366 | $ 5,429
JPY | Financial liabilities |  |
Statement [line items] |  |
Foreign currency | $ 375,040 | $ 824,224
Exchange rate | 156.1934 | 141.3674
Functional currency | $ 2,401 | $ 5,830
JPY | Financial assets |  |
Statement [line items] |  |
Foreign currency | $ 352,275 | $ 993,351
Exchange rate | 156.1934 | 141.3674
Functional currency | $ 2,255 | $ 7,027

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