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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, 2025
Dec. 31, 2024
Financial Assets    
Cash and Cash Equivalents $ 506,279 $ 504,441
Other 13,173 9,570
Total Financial Assets 660,564 650,612
Financial Liabilities    
Total Financial Liabilities 11,831 3,172
Investments—Consolidated Investment Companies    
Financial Assets    
Investments 72,252 82,441
Investments—Affiliates and Other    
Financial Assets    
Investments 68,860 54,160
Level 1    
Financial Assets    
Cash and Cash Equivalents 506,279 504,441
Other 10,620 9,570
Total Financial Assets 590,922 577,948
Financial Liabilities    
Total Financial Liabilities 0 0
Level 1 | Investments—Consolidated Investment Companies    
Financial Assets    
Investments 6,833 12,090
Level 1 | Investments—Affiliates and Other    
Financial Assets    
Investments 67,190 51,847
Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 2,553 0
Total Financial Assets 69,624 72,641
Financial Liabilities    
Total Financial Liabilities 0 2,819
Level 2 | Investments—Consolidated Investment Companies    
Financial Assets    
Investments 65,419 70,351
Level 2 | Investments—Affiliates and Other    
Financial Assets    
Investments 1,652 2,290
Level 3    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 0 0
Total Financial Assets 18 23
Financial Liabilities    
Total Financial Liabilities 11,831 353
Level 3 | Investments—Consolidated Investment Companies    
Financial Assets    
Investments 0 0
Level 3 | Investments—Affiliates and Other    
Financial Assets    
Investments $ 18 $ 23