XML 104 R50.htm IDEA: XBRL DOCUMENT v3.23.3
Investments - Summary of Investments (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
investment
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
investment
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments          
Cost method investment ownership percentage 10.00%   10.00%    
Number of equity method investments | investment 9   9    
Fair Value, Investments, Privately Held Entities that Calculate NAV, Unfunded Commitments $ 381,500   $ 381,500    
Limited partnership maximum expiration terms     12 years    
Weighted-average remaining liquidation term (in years)     5 years 6 months    
Limited partnership liquidation, expected initial term (in years)     10 years    
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount (28,500)   $ 51,500    
Equity Securities, FV-NI, Realized Gain 25,000   68,400    
Income from equity method investments 242 $ 40 617 $ 473  
Summary of Investment [Abstract]          
Investment at fair value, cost 1,181,833   1,181,833   $ 1,152,613
Cumulative unrealized gains on investments 311,448   311,448   506,404
Cumulative unrealized losses on investments (135,425)   (135,425)   (109,402)
Investments accounted for under the equity method 73,910   73,910   65,459
Total investments held at adjusted carrying value or fair value 1,431,766   1,431,766   1,615,074
Investment Income, Net [Abstract]          
Realized (losses) gains (3,470) 24,210 16,903 75,971  
Unrealized losses (77,202) (56,515) (220,954) (388,076)  
Investment loss (80,672) $ (32,305) (204,051) (312,105)  
Equity Method Investments          
Schedule of Investments          
Income from equity method investments     (2,400)    
Investments in publicly traded companies          
Summary of Investment [Abstract]          
Investment at fair value, cost 197,822   197,822   210,986
Cumulative unrealized gains on investments 41,225   41,225   96,271
Cumulative unrealized losses on investments (109,461)   (109,461)   (100,118)
Investments at fair value, book value 129,586   $ 129,586   207,139
Investments in privately held entities that report NAV          
Schedule of Investments          
Weighted-average remaining liquidation term (in years)     8 years 3 months 18 days    
Summary of Investment [Abstract]          
Investment at fair value, cost 492,151   $ 492,151   452,391
Cumulative unrealized gains on investments 191,378   191,378   315,071
Cumulative unrealized losses on investments (24,740)   (24,740)   (7,710)
Investments at fair value, book value 658,789   658,789   759,752
Investments in privately held entities that do not report NAV | Entities with observable price change          
Schedule of Investments          
Investment in privately held entities that do not report NAV, cumulative price adjustments (31,100)   (31,100)    
Investments in privately held entities that do not report NAV, cumulative upward price adjustment 78,800   78,800    
Investments in privately held entities that do not report NAV, cumulative downward price adjustment (1,200)   (1,200)    
Investments in privately held entities that do not report NAV, cumulative impairment loss (108,700)   (108,700)    
Annual adjustments recognized on investments in privately held entities that do not report NAV     57,700 1,800  
Investments in privately held entities that do not report NAV, annual upward price adjustment     16,500 25,200  
Investments in privately held entities that do not report NAV, annual downward price adjustment     74,200 23,400  
Summary of Investment [Abstract]          
Investment at fair value, cost 104,105   104,105   100,296
Cumulative unrealized gains on investments 78,845   78,845   95,062
Cumulative unrealized losses on investments (1,224)   (1,224)   (1,574)
Investments in privately held entities that do not report fair value, book value 181,726   181,726   193,784
Investments in privately held entities that do not report NAV | Entities without observable price changes          
Summary of Investment [Abstract]          
Investment at fair value, cost 387,755   387,755   388,940
Cumulative unrealized gains on investments 0   0   0
Cumulative unrealized losses on investments 0   0   0
Investments in privately held entities that do not report fair value, book value $ 387,755   387,755   $ 388,940
Total investments held          
Investment Income, Net [Abstract]          
Unrealized losses     $ (97,800) $ (301,800)