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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, 2021
Dec. 31, 2020
Financial Assets    
Investments—Consolidated Investment Companies $ 105,542 $ 91,359
Investments—Affiliates and Other 87,805 45,593
Fair Value, Measurements, Recurring    
Financial Assets    
Cash and Cash Equivalents 233,327 301,819
Investments—Consolidated Investment Companies 105,542 91,359
Investments—Affiliates and Other 87,805 45,593
Other 7,105 14,331
Total Financial Assets 433,779 453,102
Financial Liabilities    
Total Financial Liabilities 13,296 12,985
Fair Value, Measurements, Recurring | Level 1    
Financial Assets    
Cash and Cash Equivalents 233,327 301,819
Investments—Consolidated Investment Companies 38,799 13,622
Investments—Affiliates and Other 82,594 40,010
Other 7,105 9,188
Total Financial Assets 361,825 364,639
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 66,743 77,737
Investments—Affiliates and Other 5,165 5,247
Other 0 5,143
Total Financial Assets 71,908 88,127
Financial Liabilities    
Total Financial Liabilities 1,644 89
Fair Value, Measurements, Recurring | Level 3    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies 0 0
Investments—Affiliates and Other 46 336
Other 0 0
Total Financial Assets 46 336
Financial Liabilities    
Total Financial Liabilities $ 11,652 $ 12,896