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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
Jun. 30, 2025
Dec. 31, 2024
Financial Assets    
Cash and Cash Equivalents $ 370,987 $ 504,441
Other 15,177 9,570
Total Financial Assets 622,656 650,612
Financial Liabilities    
Total Financial Liabilities 8,636 3,172
Investments—Consolidated Investment Companies    
Financial Assets    
Investments 179,578 82,441
Investments—Affiliates and Other    
Financial Assets    
Investments 56,914 54,160
Level 1    
Financial Assets    
Cash and Cash Equivalents 370,987 504,441
Other 6,954 9,570
Total Financial Assets 457,462 577,948
Financial Liabilities    
Total Financial Liabilities 0 0
Level 1 | Investments—Consolidated Investment Companies    
Financial Assets    
Investments 24,837 12,090
Level 1 | Investments—Affiliates and Other    
Financial Assets    
Investments 54,684 51,847
Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 8,223 0
Total Financial Assets 165,175 72,641
Financial Liabilities    
Total Financial Liabilities 0 2,819
Level 2 | Investments—Consolidated Investment Companies    
Financial Assets    
Investments 154,741 70,351
Level 2 | Investments—Affiliates and Other    
Financial Assets    
Investments 2,211 2,290
Level 3    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 0 0
Total Financial Assets 19 23
Financial Liabilities    
Total Financial Liabilities 8,636 353
Level 3 | Investments—Consolidated Investment Companies    
Financial Assets    
Investments 0 0
Level 3 | Investments—Affiliates and Other    
Financial Assets    
Investments $ 19 $ 23