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Non-Consolidated Affiliates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 31, 2021
Feb. 11, 2020
May 31, 2018
Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]              
Investments in non-consolidated affiliates $ 435,394 $ 454,936          
Equity in income (loss) of non-consolidated affiliates (19,490) 44,459 $ (32,517)        
Distributions from non-consolidated affiliates 523 15,084 0        
Distributions from non-consolidated affiliates 34,384 42,334 14,059        
Avillion II | Merck Asset - Phase II Clinical Trial              
Schedule of Equity Method Investments [Line Items]              
Other commitment       $ 122,500   $ 105,000 $ 19,000
Other commitments, percentage of costs (as a percent)             50.00%
Avillion II | AZ Asset - Phase II and Phase III Clinical Trial              
Schedule of Equity Method Investments [Line Items]              
Other commitments, percentage of costs (as a percent)           44.00%  
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Legacy Investors Partnerships              
Schedule of Equity Method Investments [Line Items]              
Investments in non-consolidated affiliates         $ 303,700    
Equity in income (loss) of non-consolidated affiliates 8,900 62,000          
Distributions from non-consolidated affiliates 21,000 22,700          
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Avillion Entities              
Schedule of Equity Method Investments [Line Items]              
Equity in income (loss) of non-consolidated affiliates (28,400) (17,600) (32,500)        
Equity method investment, unfunded commitments (11,200) 28,600          
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Avillion I              
Schedule of Equity Method Investments [Line Items]              
Distributions from non-consolidated affiliates $ 13,400 13,400 $ 14,100        
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Avillion II              
Schedule of Equity Method Investments [Line Items]              
Distributions from non-consolidated affiliates   $ 21,300