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Financial Instruments - Currency risk (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares
NTD | Financial liabilities |  |
Statement [line items] |  |
Foreign currency | $ 1,422,137 | $ 2,900,734
Exchange rate | 30.705 | 30.71
Functional currency | $ 46,315 | $ 94,456
NTD | Financial assets |  |
Statement [line items] |  |
Foreign currency | $ 281,550 | $ 333,733
Exchange rate | 30.705 | 30.71
Functional currency | $ 9,170 | $ 10,867
CNY | Financial assets |  |
Statement [line items] |  |
Foreign currency | $ 38,528 | $ 37,346
Exchange rate | 7.0972 | 6.9669
Functional currency | $ 5,429 | $ 5,360
JPY | Financial liabilities |  |
Statement [line items] |  |
Foreign currency | $ 824,224 | $ 1,080,956
Exchange rate | 141.3674 | 132.1429
Functional currency | $ 5,830 | $ 8,180
JPY | Financial assets |  |
Statement [line items] |  |
Foreign currency | $ 993,351 | $ 1,110,308
Exchange rate | $ / shares | 141.3674 | 132.1429
Functional currency | $ 7,027 | $ 8,402

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