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Intangible Assets, Net (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 12,500,000 $ 14,400,000 $ 38,800,000
Sohu [Member] | Sohu Video's intangible assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total losses for impairment 14,000 1,500,000 4,000,000.0
Sohu [Member] | 56.com Website's intangible assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total losses for impairment     $ 7,200,000
Changyou [Member] | Content and game licenses intangible assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total losses for impairment 1,700,000 2,700,000  
Intangible assets impairment losses 100,000 800,000  
Prepaid and other current assets impairment losses $ 1,600,000 $ 1,900,000