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Income Taxes - Reconciliation of the PRC statutory tax rate to the effective tax rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount      
PRC Statutory EIT rate $ 151,399    
Changes in Valuation Allowances 6,278    
Nontaxable and Nondeductible Items      
Effect on tax holiday and preferential tax treatment (37,011)    
Research and development tax credits (18,172)    
Investment related gain (6,608)    
Other 1,696    
Changes in Unrecognized Tax Benefits      
Stock-based compensation (646)    
Other Adjustments      
Effect of PRC withholding tax 41,897    
Other Adjustments 3,527    
Income tax expense $ 144,521 $ 110,550 $ 145,287
Tax Jurisdiction of Domicile [Extensible Enumeration] CHINA    
Percent      
PRC Statutory EIT rate 25.00% 25.00% 25.00%
Change in valuation allowance 1.00% 4.40% 5.00%
Nontaxable and Nondeductible Items      
Effect on tax holiday and preferential tax treatment (6.10%) (11.00%) (9.50%)
Research and development super-deduction (3.00%) (5.30%) (4.40%)
Non-deductible expenses and non-taxable income and others   1.00% 3.50%
Investments related gain/loss (1.10%)    
Other 0.30%    
Changes in Unrecognized Tax Benefits      
Stock-based compensation (0.10%)    
Other Adjustments      
Effect of PRC withholding tax 6.90% 5.20% 8.70%
Tax rate difference from statutory rate in other jurisdictions 0.60% 9.00% 7.60%
Effective tax rate for the Group 23.90% 26.30% 28.90%
Cayman Islands      
Amount      
Foreign Tax Effects $ 14,766    
Percent      
Foreign Tax Effects 2.40%    
Hong Kong      
Amount      
Foreign Tax Effects $ (12,915)    
Percent      
Foreign Tax Effects (2.10%)    
Other foreign jurisdictions      
Amount      
Foreign Tax Effects $ 310    
Percent      
Foreign Tax Effects 0.10%