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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, 2024
Dec. 31, 2023
Financial Assets    
Cash and Cash Equivalents $ 374,952 $ 383,180
Other 16,250 7,804
Total Financial Assets 581,278 568,479
Financial Liabilities    
Total Financial Liabilities 8,260 7,961
Investments—Consolidated Investment Companies    
Financial Assets    
Investments 116,380 70,543
Investments—Affiliates and Other    
Financial Assets    
Investments 73,696 106,952
Level 1    
Financial Assets    
Cash and Cash Equivalents 374,952 383,180
Other 10,129 6,160
Total Financial Assets 481,394 505,083
Financial Liabilities    
Total Financial Liabilities 0 0
Level 1 | Investments—Consolidated Investment Companies    
Financial Assets    
Investments 25,583 11,402
Level 1 | Investments—Affiliates and Other    
Financial Assets    
Investments 70,730 104,341
Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 6,121 1,644
Total Financial Assets 99,862 63,373
Financial Liabilities    
Total Financial Liabilities 0 335
Level 2 | Investments—Consolidated Investment Companies    
Financial Assets    
Investments 90,797 59,141
Level 2 | Investments—Affiliates and Other    
Financial Assets    
Investments 2,944 2,588
Level 3    
Financial Assets    
Cash and Cash Equivalents 0 0
Other 0 0
Total Financial Assets 22 23
Financial Liabilities    
Total Financial Liabilities 8,260 7,626
Level 3 | Investments—Consolidated Investment Companies    
Financial Assets    
Investments 0 0
Level 3 | Investments—Affiliates and Other    
Financial Assets    
Investments $ 22 $ 23