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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, 2022
Dec. 31, 2021
Financial Assets    
Investments—Consolidated Investment Companies $ 104,370 $ 105,542
Investments—Affiliates and Other 91,067 87,805
Fair Value, Measurements, Recurring    
Financial Assets    
Cash and Cash Equivalents 262,043 233,327
Investments—Consolidated Investment Companies 104,370 105,542
Investments—Affiliates and Other 91,067 87,805
Other 7,007 7,105
Total Financial Assets 464,487 433,779
Financial Liabilities    
Total Financial Liabilities 8,790 13,296
Fair Value, Measurements, Recurring | Level 1    
Financial Assets    
Cash and Cash Equivalents 262,043 233,327
Investments—Consolidated Investment Companies 46,190 38,799
Investments—Affiliates and Other 85,713 82,594
Other 7,007 7,105
Total Financial Assets 400,953 361,825
Financial Liabilities    
Total Financial Liabilities 0 0
Fair Value, Measurements, Recurring | Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies 58,180 66,743
Investments—Affiliates and Other 5,306 5,165
Other 0 0
Total Financial Assets 63,486 71,908
Financial Liabilities    
Total Financial Liabilities 4,082 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 48 46
Other 0 0
Total Financial Assets 48 46
Financial Liabilities    
Total Financial Liabilities $ 4,708 $ 11,652