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Long-term Investments - Changes in Long-term Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Long-term investments      
Balance at the beginning of the year $ 993,630 $ 1,207,651 $ 1,179,466
Investments made/transfers from prepayments 374,709 151,332 278,968
Income from equity method investments, net 13,392 (24,069) 14,217
Dividend declared from equity method investments (4,683) (5,772) (11,695)
Disposal of investments (17,713) (36,267) (80,613)
Changes from measurement alternative to consolidation (Note 6) (43,988)   (66,415)
Impairment on investments (25,706) (63,515) (106,800)
Fair value change through earnings 43,002 (196,602) (13,439)
Currency translation adjustment (12,257) (39,128) 13,962
Balance at the end of year 1,320,386 993,630 1,207,651
Equity Securities Without Readily Determinable Fair Values      
Long-term investments      
Balance at the beginning of the year 196,579 268,716 579,084
Investments made/transfers from prepayments 70,864 36,423 96,768
Disposal of investments (3,463) (29,974) (75,667)
Changes from measurement alternative to consolidation (Note 6) (43,988)   (66,415)
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values     (142,000)
Impairment on investments (25,706) (63,515) (106,800)
Fair value change through earnings 10,877   (23,316)
Currency translation adjustment (3,873) (15,071) 7,062
Balance at the end of year 201,290 196,579 268,716
Equity Method Investment      
Long-term investments      
Balance at the beginning of the year 557,501 502,783 311,161
Investments made/transfers from prepayments 303,845 114,909 182,200
Income from equity method investments, net 13,392 (24,069) 14,217
Dividend declared from equity method investments (4,683) (5,772) (11,695)
Disposal of investments (14,250) (6,293)  
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values 153,407    
Currency translation adjustment (8,384) (24,057) 6,900
Balance at the end of year 1,000,828 557,501 502,783
Equity Securities With Readily Determinable Fair Values      
Long-term investments      
Balance at the beginning of the year 239,550 436,152 289,221
Disposal of investments     (4,946)
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values (153,407)   142,000
Fair value change through earnings 32,125 (196,602) 9,877
Balance at the end of year $ 118,268 $ 239,550 $ 436,152