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Fair Value Measurements - Classes of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Financial Assets    
Investments—Consolidated Investment Companies $ 108,448 $ 105,542
Investments—Affiliates and Other 76,524 87,805
Fair Value, Measurements, Recurring    
Financial Assets    
Cash and Cash Equivalents 336,782 233,327
Investments—Consolidated Investment Companies 108,448 105,542
Investments—Affiliates and Other 76,524 87,805
Other 7,007 7,105
Total Financial Assets 528,761 433,779
Financial Liabilities    
Total Financial Liabilities 8,470 13,296
Fair Value, Measurements, Recurring | Level 1    
Financial Assets    
Cash and Cash Equivalents 336,782 233,327
Investments—Consolidated Investment Companies 49,119 38,799
Investments—Affiliates and Other 71,369 82,594
Other 6,538 7,105
Total Financial Assets 463,808 361,825
Financial Liabilities    
Total Financial Liabilities 27 0
Fair Value, Measurements, Recurring | Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies 59,329 66,743
Investments—Affiliates and Other 5,130 5,165
Other 469 0
Total Financial Assets 64,928 71,908
Financial Liabilities    
Total Financial Liabilities 4 1,644
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 46
Other 0 0
Total Financial Assets 25 46
Financial Liabilities    
Total Financial Liabilities $ 8,439 $ 11,652