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Taxation (PRC Withholding Tax on Dividends) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Apr. 05, 2018
Withholding tax on dividends [Line Items]            
Withholding income tax rate on dividends, foreign invested enterprises to foreign holding companies     10.00%      
Special cash dividend           $ 500,000
Additional withholding income taxes $ 88,000 $ 47,000        
Deferred tax liabilities related to withholding tax     $ 237,116 $ 206,594    
Total amount of undistributed profits     484,900      
Unrecognized tax liabilities     48,500      
Changyou [Member]            
Withholding tax on dividends [Line Items]            
Deferred tax liabilities related to withholding tax     $ 237,100   $ 86,800  
HONG KONG            
Withholding tax on dividends [Line Items]            
Preferential withholding tax rate on dividends, foreign invested enterprises     5.00%      
CHINA            
Withholding tax on dividends [Line Items]            
Withholding income tax rate on dividends, foreign invested enterprises to foreign holding companies     10.00%      
Additional withholding income taxes       $ 88,000