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Investments - Narrative (Details)
 3 Months Ended 12 Months Ended
Sep. 25, 2017
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
investment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Unusual or Infrequent Item, or Both [Line Items]          
Non-cash exchange of available-for-sale debt securities   $ 18,300,000      
Gain (loss) on investments   $ (4,400,000) $ (20,991,000) $ (4,211,000) $ (73,000)
Impairment loss on equity securities without readily determinable fair value     19,605,000 4,164,000  
Equity securities, cumulative impairment loss     23,800,000    
Other-than-temporary impairment losses recognized on debt securities     0 0 0
Variable interest entity, amount committed to invest $ 200,000,000        
Variable interest entity, ownership percentage 76.60%        
Annual management fee percentage 2.00%        
Management fee annual reduction percentage 10.00%        
Entitled carried interest percentage 20.00%        
Net investment income (loss)     (11,338,000) (168,000) (4,140,000)
Variable interest entity, amount of capital call notices received     32,900,000 29,600,000  
Variable interest entity, amount paid     31,900,000 29,600,000  
Distribution from equity method investment     0 10,288,000 0
Management fees recognized     3,000,000.0 $ 3,000,000.0 $ 4,500,000
COVID-19          
Unusual or Infrequent Item, or Both [Line Items]          
Net investment income (loss)     $ (4,300,000)    
Number of investments impaired | investment     2    
Equity method investment, impairment     $ 7,000,000.0