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Fair Value Measurements (Short-term Investments, Long-term Investments and Long-term Time Deposits) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
 [1]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in financial instruments   $ 399,345 $ 100,745  
Impairment loss $ 23,200 $ 215 [1] 384 [1] $ 23,154
Time deposit [Member] | Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted investment maturity period   3 months    
Time deposit [Member] | Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted investment maturity period   1 year    
Long Term Time Deposit [Member] | Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted investment maturity period   1 year    
Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in financial instruments   $ 399,300 100,700  
Change in fair value of short-term investments   5,300 4,300  
Impairment loss   $ 200 $ 400  
[1] In the fourth quarter of 2019, the Sohu Group recognized impairment losses of $23.2 million for equity investments.