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CONSOLIDATED ENTITIES - ISP Fund LP (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 11, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CONSOLIDATED ENTITIES        
Total assets   $ 999,570 $ 724,826  
Initial contribution   387,981 0 $ 0
Unrealized loss on equity investments   50,277 $ 0 $ 0
ISP Fund LP        
CONSOLIDATED ENTITIES        
Total assets   $ 299,300    
Economic interest (in percent)   100.00%    
Net investment-related expense   $ 400    
Unrealized loss on equity investments   $ 400    
Contributed to partnership for investing $ 300,000      
Lock-up period 36 months      
ISP Fund LP | General Partner        
CONSOLIDATED ENTITIES        
Percentage of annual performance allocation based on net profits 10.00%