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Other Income, Net (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Income and Expense [Line Items]        
Impairment loss $ 23,200 $ 215 [1] $ 384 [1] $ 23,154 [1]
Sogou [Member]        
Other Income and Expense [Line Items]        
Cash proceeds from operating lease   $ 12,300 $ 12,100 $ 8,400
[1] In the fourth quarter of 2019, the Sohu Group recognized impairment losses of $23.2 million for equity investments.