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Investments (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 25, 2017
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
investment
Dec. 31, 2020
USD ($)
Unusual or Infrequent Item, or Both [Line Items]            
Loss on investments, net   $ 16,677 $ 3 $ 16,677 $ 20,835  
Impairment loss on equity securities without readily determinable fair value       16,677 19,600 $ 19,605
Recognized loss on exchange of available-for-sale debt securities         4,400  
Gain on purchase of preferred stock         3,200  
Purchase of preferred stock         800  
Cumulative impairment losses   40,500   $ 40,500    
Variable interest entity, amount committed to invest $ 200,000          
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%          
Investment period       6 years    
Variable interest entity, amount of capital call notices received       $ 11,100 26,500  
Variable interest entity, amount paid       10,100 26,500  
Income (loss) from equity method investment   (5,752) (5,821) 18,519 (10,090) (3,100)
Management fees recognized   $ 800 $ 800 $ 1,500 $ 1,500  
COVID-19            
Unusual or Infrequent Item, or Both [Line Items]            
Number of investments impaired | investment         2  
Equity method investment, impairment           $ 7,000