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Investment Information - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
lots
Dec. 31, 2020
USD ($)
lots
Dec. 31, 2019
USD ($)
Continuous unrealized loss, qualitative disclosures:      
Number of positions in an unrealized loss position (lots) | lots 4,700 2,320  
Total number of positions (lots) | lots 10,240 11,180  
Largest single loss $ 1,100 $ 900  
Equity securities, at fair value 1,804,170 1,444,830  
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]      
Equity in net income (loss) of investment funds accounted for using the equity method $ 366,402 $ 146,693 $ 123,672
Equity method investments, time lag for reporting - low end of range 1 month    
Equity method investments, time lag for reporting - high end of range 3 months