Long-term Investments - Changes in Long-term Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Long-term investments      
Balance at the beginning of the year $ 1,179,466 $ 1,027,459 $ 694,586
Investments made/transfers from prepayments 278,968 258,350 375,620
Income from equity method investments, net 14,217 10,434 (13,198)
Dividend received from equity method investments (11,695) (320) (932)
Disposal of investments (80,613) (50,401) (1,889)
Changes from measurement alternative to consolidation (Note 6) (66,415)    
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values 0   0
Impairment of investments (106,800) (126,820) (230,859)
Fair value change through earnings (including adjustment of subsequent price changes) (72,787) 35,115 207,438
Fair value change through earnings (13,439)    
Currency translation adjustment 13,962 25,649 (3,307)
Balance at the end of year 1,207,651 1,179,466 1,027,459
Showworld      
Long-term investments      
Fair value change gain 1,000 204,700  
Cost Method      
Long-term investments      
Balance at the beginning of the year 579,084 558,602 570,619
Investments made/transfers from prepayments 96,768 134,925 268,734
Income from equity method investments, net 0 0 0
Dividend received from equity method investments 0 0 0
Disposal of investments (75,667) (2,067) (1,724)
Changes from measurement alternative to consolidation (Note 6) (66,415)    
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values (142,000)   (81,385)
Impairment of investments (106,800) (126,820) (230,859)
Fair value change through earnings (including adjustment of subsequent price changes)   (2,462) 35,838
Fair value change through earnings (23,316)    
Currency translation adjustment 7,062 16,906 (2,621)
Balance at the end of year 268,716 579,084 558,602
Equity Method      
Long-term investments      
Balance at the beginning of the year 311,161 199,379 122,491
Investments made/transfers from prepayments 182,200 92,925 91,869
Income from equity method investments, net 14,217 10,434 (13,198)
Dividend received from equity method investments (11,695) (320) (932)
Disposal of investments 0 0 (165)
Changes from measurement alternative to consolidation (Note 6) 0    
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values 0   0
Impairment of investments 0 0 0
Fair value change through earnings (including adjustment of subsequent price changes)   0 0
Fair value change through earnings 0    
Currency translation adjustment 6,900 8,743 (686)
Balance at the end of year 502,783 311,161 199,379
Equity Securities With Readily Determinable Fair Values      
Long-term investments      
Balance at the beginning of the year 289,221 269,478 1,476
Investments made/transfers from prepayments 0 30,500 15,017
Income from equity method investments, net 0 0 0
Dividend received from equity method investments 0 0 0
Disposal of investments (4,946) (48,334) 0
Changes from measurement alternative to consolidation (Note 6) 0    
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values 142,000   81,385
Impairment of investments 0 0 0
Fair value change through earnings (including adjustment of subsequent price changes)   37,577 171,600
Fair value change through earnings 9,877    
Currency translation adjustment 0 0 0
Balance at the end of year $ 436,152 $ 289,221 $ 269,478