Long-term Investments - Impairment (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Long-term Investments      
Impairment charge $ 106,800,000 $ 211,985,000 $ 249,935,000
Write-offs of prepayments 0 1,500,000 $ 19,100,000
Equity Method      
Long-term Investments      
Other impairments   30,700,000  
A game company | Equity Method      
Long-term Investments      
Impairment charge   39,300,000  
A game company | Cost Method      
Long-term Investments      
Impairment charge   39,300,000  
Loans to investees.      
Long-term Investments      
Impairment charge 82,200,000    
Yixia Tech | Cost Method      
Long-term Investments      
Impairment charge $ 75,300,000    
Equity Investee In ECommerce Business | Cost Method      
Long-term Investments      
Impairment charge   $ 59,800,000