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Income Taxes - Reconciliation of the expected income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes      
Income tax expense calculated at the statutory rate 20.00% 20.00% 20.00%
Tax on undistributed earnings 3.00% 8.00% (10.80%)
Tax-exempt income (0.00%) (0.00%) (16.20%)
Tax benefit resulting from setting aside legal reserve from prior year's income 0.00% 0.30% (0.80%)
Tax benefit resulting from offsetting prior year's undistributed earning tax with current year's loss 0.00% 2.80% 0.00%
Increase in tax credits (12.10%) 17.10% (75.60%)
Effect of change of unrecognized deductible temporary differences, tax losses carryforwards, and investment tax credits 8.70% (40.90%) 100.20%
Net of non-taxable income and non-deductible expense (0.20%) 2.20% 2.10%
Capital gain Tax 0.00% 0.00% (1.60%)
Changes in unrecognized tax benefits related to prior year tax positions, net of its impact to tax-exempted income (1.20%) (1.20%) 6.30%
Foreign tax rate differential 1.50% (3.50%) 12.10%
Variance from audits, amendments and examinations of prior years' income tax filings (0.60%) (2.30%) (0.80%)
Effect of tax rate changes 0.00% 0.00% (17.10%)
Others 1.10% (0.70%) 0.60%
Effective tax rate 20.60% (2.60%) 14.20%
Profit (loss) before income taxes $ 56,872 $ (15,768) $ 7,020
Income tax expense calculated at the statutory rate 11,374 (3,154) 1,404
Tax on undistributed earnings 1,727 (1,261) (755)
Tax-exempt income 0   (1,135)
Tax benefit resulting from setting aside legal reserve from prior year's income 0 (51) (56)
Tax benefit resulting from offsetting prior year's undistributed earning tax with current year's loss 0 (443)  
Increase in tax credits (6,895) (2,698) (5,306)
Effect of change of unrecognized deductible temporary differences, tax losses carryforwards, and investment tax credits 4,954 6,455 7,034
Net of non-taxable income and non-deductible expense 129 343 151
Capital gain Tax 0   (116)
Changes in unrecognized tax benefits related to prior year tax positions, net of its impact to tax-exempted income (709) 194 440
Foreign tax rate differential 881 548 850
Variance from audits, amendments and examinations of prior years' income tax filings (363) 368 (58)
Effect of tax rate changes 0   (1,199)
Others 614 115 42
Income tax expense $ 11,712 $ 416 $ 994