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Fair Value Measurements - Classes of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Financial Assets    
Investments—Consolidated Investment Companies $ 107,277 $ 105,542
Investments—Affiliates and Other 69,399 87,805
Fair Value, Measurements, Recurring    
Financial Assets    
Cash and Cash Equivalents 304,520 233,327
Investments—Consolidated Investment Companies 107,277 105,542
Investments—Affiliates and Other 69,399 87,805
Other 6,130 7,105
Total Financial Assets 487,326 433,779
Financial Liabilities    
Total Financial Liabilities 15,813 13,296
Fair Value, Measurements, Recurring | Level 1    
Financial Assets    
Cash and Cash Equivalents 304,520 233,327
Investments—Consolidated Investment Companies 44,061 38,799
Investments—Affiliates and Other 64,426 82,594
Other 6,130 7,105
Total Financial Assets 419,137 361,825
Financial Liabilities    
Total Financial Liabilities 141 0
Fair Value, Measurements, Recurring | Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies 62,965 66,743
Investments—Affiliates and Other 4,948 5,165
Other 0 0
Total Financial Assets 67,913 71,908
Financial Liabilities    
Total Financial Liabilities 11,291 1,644
Fair Value, Measurements, Recurring | Level 3    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies 251 0
Investments—Affiliates and Other 25 46
Other 0 0
Total Financial Assets 276 46
Financial Liabilities    
Total Financial Liabilities $ 4,381 $ 11,652