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Non-Consolidated Affiliates (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2022
Feb. 11, 2020
Schedule of Equity Method Investments [Line Items]            
Equity method investments   $ 397,175 $ 435,394      
Income (loss) from equity method investments   (8,973) (19,490) $ 44,459    
Distributions from equity method investees   0 523 15,084    
Legacy Investors Partnerships            
Schedule of Equity Method Investments [Line Items]            
Equity method investments           $ 303,700
Income (loss) from equity method investments   3,000 8,900 62,000    
Distributions from equity method investees   25,700 21,000 22,700    
Avillion Entities            
Schedule of Equity Method Investments [Line Items]            
Income (loss) from equity method investments   (12,000) (28,400) (17,600)    
Equity method investment, unfunded commitments   (28,800) (11,200)      
Avillion I            
Schedule of Equity Method Investments [Line Items]            
Distributions from equity method investees   $ 13,400 $ 13,400 $ 13,400    
Avillion II | Subsequent Event            
Schedule of Equity Method Investments [Line Items]            
Proceeds exercise fee $ 80,000          
Exercise fee, pro rata amount $ 35,000          
Avillion II | Merck Asset - Phase II Clinical Trial            
Schedule of Equity Method Investments [Line Items]            
Other commitment         $ 150,000