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Long-term Investments - Changes in Long-term Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Long-term investments      
Balance at the beginning of the year $ 1,389,199 $ 1,320,386 $ 993,630
Investments made/transfers from prepayments/other non-current assets 186,395 162,823 374,709
Income (Loss) from equity method investments, net 76,666 (12,170) 13,392
Dividend declared from equity method investments (12,807) (10,269) (4,683)
Disposal of investments (23,982) (24,039) (17,713)
Changes from measurement alternative to consolidation (Note 6)     (43,988)
Reclassification of equity investment with readily determinable fair value to equity-method investment     0
Impairment on investments (5,972) (38,689) (25,706)
Fair value change through earnings 21,258 18,564 43,002
Currency translation adjustment 32,589 (27,407) (12,257)
Balance at the end of year 1,663,346 1,389,199 1,320,386
Equity Securities Without Readily Determinable Fair Values      
Long-term investments      
Balance at the beginning of the year 295,975 201,290 196,579
Investments made/transfers from prepayments/other non-current assets 357 136,985 70,864
Income (Loss) from equity method investments, net 0 0 0
Dividend declared from equity method investments 0 0 0
Disposal of investments (522) (2,228) (3,463)
Changes from measurement alternative to consolidation (Note 6)     (43,988)
Reclassification of equity investment with readily determinable fair value to equity-method investment     0
Impairment on investments (5,972) (38,689) (25,706)
Fair value change through earnings 0 0 10,877
Currency translation adjustment 1,854 (1,383) (3,873)
Balance at the end of year 291,692 295,975 201,290
Equity Method Investment      
Long-term investments      
Balance at the beginning of the year 956,392 1,000,828 557,501
Investments made/transfers from prepayments/other non-current assets 186,038 25,838 303,845
Income (Loss) from equity method investments, net 76,666 (12,170) 13,392
Dividend declared from equity method investments (12,807) (10,269) (4,683)
Disposal of investments (23,460) (21,811) (14,250)
Changes from measurement alternative to consolidation (Note 6)     0
Reclassification of equity investment with readily determinable fair value to equity-method investment     153,407
Impairment on investments 0 0 0
Fair value change through earnings 0 0 0
Currency translation adjustment 30,735 (26,024) (8,384)
Balance at the end of year 1,213,564 956,392 1,000,828
Equity Securities With Readily Determinable Fair Values      
Long-term investments      
Balance at the beginning of the year 136,832 118,268 239,550
Investments made/transfers from prepayments/other non-current assets 0 0 0
Income (Loss) from equity method investments, net 0 0 0
Dividend declared from equity method investments 0 0 0
Disposal of investments 0 0 0
Changes from measurement alternative to consolidation (Note 6)     0
Reclassification of equity investment with readily determinable fair value to equity-method investment     (153,407)
Impairment on investments 0 0 0
Fair value change through earnings 21,258 18,564 32,125
Currency translation adjustment 0 0 0
Balance at the end of year $ 158,090 $ 136,832 $ 118,268