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Investments (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 25, 2017
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
investment
Unusual or Infrequent Item, or Both [Line Items]              
Loss on investments, net   $ 0 $ 16,700 $ 156 $ 16,677 $ 20,991 $ 3,800
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         $ 21,200 31,000  
Variable interest entity, amount paid         21,200 30,000  
Variable interest entity, distribution received   15,300     15,300    
Income (loss) from equity method investment   (1,923)   (709) 16,596 (10,799)  
Management fees recognized   $ 800   $ 800 $ 2,300 $ 2,300  
COVID-19              
Unusual or Infrequent Item, or Both [Line Items]              
Number of investments impaired | investment             2
Equity method investment, impairment             $ 7,000