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Income Taxes - Reconciliation of the expected income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes      
Income tax expense calculated at the statutory rate 20.00% 20.00% 20.00%
Tax on undistributed earnings 4.20% 3.00% 8.00%
Tax benefit resulting from setting aside legal reserve from prior year's income 0.00% 0.00% 0.30%
Tax benefit resulting from offsetting prior year's undistributed earning tax with current year's loss 0.00% 0.00% 2.80%
Tax benefit resulting from actual investment from prior year's undistributed earnings 0.00% 0.00% 0.00%
Increase in tax credits (3.30%) (12.10%) 17.10%
Effect of change of unrecognized deductible temporary differences, tax losses carryforwards, and investment tax credits 0.70% 8.70% (40.90%)
Net of non-taxable income and non-deductible expense (2.00%) 0.20% (2.20%)
Changes in unrecognized tax benefits related to prior year tax positions, net of its impact to tax-exempted income 0.50% (1.20%) (1.20%)
Foreign tax rate differential 0.20% 1.50% (3.50%)
Variance from audits, amendments and examinations of prior years' income tax filings 0.00% (0.60%) (2.30%)
Others 0.00% 1.10% (0.70%)
Effective tax rate 20.30% 20.60% (2.60%)
Profit (loss) before income taxes $ 544,592 $ 56,872 $ (15,768)
Income tax expense calculated at the statutory rate 108,919 11,374 (3,154)
Tax on undistributed earnings 22,648 1,727 (1,261)
Tax benefit resulting from setting aside legal reserve from prior year's income (267)   (51)
Tax benefit resulting from offsetting prior year's undistributed earning tax with current year's loss 0   (443)
Tax benefit resulting from actual investment from prior year's undistributed earnings (161)    
Increase in tax credits (17,934) (6,895) (2,698)
Effect of change of unrecognized deductible temporary differences, tax losses carryforwards, and investment tax credits 3,668 4,954 6,455
Net of non-taxable income and non-deductible expense 10,680 129 343
Changes in unrecognized tax benefits related to prior year tax positions, net of its impact to tax-exempted income 2,763 (709) 194
Foreign tax rate differential 837 881 548
Variance from audits, amendments and examinations of prior years' income tax filings 440 (363) 368
Others 424 614 115
Income tax expense $ 110,657 $ 11,712 $ 416