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Fair Value Measurements - Classes of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Financial Assets    
Cash and Cash Equivalents $ 376,960 $ 336,782
Other 6,623 7,007
Total Financial Assets 561,056 528,761
Financial Liabilities    
Total Financial Liabilities 11,695 8,470
Consolidated Investment Companies    
Financial Assets    
Investments 118,201 108,448
Affiliates    
Financial Assets    
Investments 59,272 76,524
Level 1    
Financial Assets    
Cash and Cash Equivalents 376,960 336,782
Other 6,623 6,538
Total Financial Assets 500,460 463,808
Financial Liabilities    
Total Financial Liabilities 48 27
Level 1 | Consolidated Investment Companies    
Financial Assets    
Investments 60,037 49,119
Level 1 | Affiliates    
Financial Assets    
Investments 56,840 71,369
Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 0 469
Total Financial Assets 60,571 64,928
Financial Liabilities    
Total Financial Liabilities 3,467 4
Level 2 | Consolidated Investment Companies    
Financial Assets    
Investments 58,164 59,329
Level 2 | Affiliates    
Financial Assets    
Investments 2,407 5,130
Level 3    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 0 0
Total Financial Assets 25 25
Financial Liabilities    
Total Financial Liabilities 8,180 8,439
Level 3 | Consolidated Investment Companies    
Financial Assets    
Investments 0 0
Level 3 | Affiliates    
Financial Assets    
Investments $ 25 $ 25