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Fair Value Measurements (Long-term Payables, Narrative) (Details) - $ / shares
Dec. 31, 2021
Apr. 17, 2020
Changyou [Member] | Share Options [Member] | Common Class A [Member] | Changyou Merger [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed price of share $ 5.39 $ 5.39