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Fair Value Measurements - Classes of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Financial Assets    
Investments—Consolidated Investment Companies $ 83,366 $ 108,448
Investments—Affiliates and Other 80,640 76,524
Fair Value, Measurements, Recurring    
Financial Assets    
Cash and Cash Equivalents 323,983 336,782
Investments—Consolidated Investment Companies 83,366 108,448
Investments—Affiliates and Other 80,640 76,524
Other 10,114 7,007
Total Financial Assets 498,103 528,761
Financial Liabilities    
Total Financial Liabilities 7,831 8,470
Fair Value, Measurements, Recurring | Level 1    
Financial Assets    
Cash and Cash Equivalents 323,983 336,782
Investments—Consolidated Investment Companies 24,083 49,119
Investments—Affiliates and Other 77,972 71,369
Other 6,624 6,538
Total Financial Assets 432,662 463,808
Financial Liabilities    
Total Financial Liabilities 0 27
Fair Value, Measurements, Recurring | Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies 59,283 59,329
Investments—Affiliates and Other 2,643 5,130
Other 3,490 469
Total Financial Assets 65,416 64,928
Financial Liabilities    
Total Financial Liabilities 0 4
Fair Value, Measurements, Recurring | Level 3    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies 0 0
Investments—Affiliates and Other 25 25
Other 0 0
Total Financial Assets 25 25
Financial Liabilities    
Total Financial Liabilities $ 7,831 $ 8,439