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Consolidated Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 30, 2022
Dec. 31, 2020
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
May 31, 2021
CONSOLIDATED ENTITIES                
Initial contribution   $ 190,000            
Total assets     $ 1,231,612   $ 1,231,612   $ 1,243,507  
Net investment-related income (expense) earned (incurred)     0   $ 300      
ISP Fund LP                
CONSOLIDATED ENTITIES                
Distribution from partnership               $ 110,000
Economic interest of the Partnership (in percent)         100.00%      
Total assets     252,400   $ 252,400   311,800  
Total liabilities     800   800   $ 100  
Changes in fair values of equity and long-term investments expense, net     $ 17,800 $ 22,400 $ 59,800 $ 22,700    
Net investment-related income (expense) earned (incurred)       $ 1,100   $ 1,200    
Capital contribution $ 110,000 $ 300,000            
Lock-up period 36 months