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Fair Value Measurements - Classes of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financial Assets    
Investments—Consolidated Investment Companies $ 98,925 $ 91,359
Investments—Affiliates and Other 71,544 45,593
Fair Value, Measurements, Recurring    
Financial Assets    
Cash and Cash Equivalents 253,732 301,819
Investments—Consolidated Investment Companies 98,925 91,359
Investments—Affiliates and Other 71,544 45,593
Other 9,728 14,331
Total Financial Assets 433,929 453,102
Financial Liabilities    
Total Financial Liabilities 11,817 12,985
Fair Value, Measurements, Recurring | Level 1    
Financial Assets    
Cash and Cash Equivalents 253,732 301,819
Investments—Consolidated Investment Companies 23,148 13,622
Investments—Affiliates and Other 65,766 40,010
Other 7,272 9,188
Total Financial Assets 349,918 364,639
Financial Liabilities    
Total Financial Liabilities 43 0
Fair Value, Measurements, Recurring | Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies 75,777 77,737
Investments—Affiliates and Other 5,455 5,247
Other 2,456 5,143
Total Financial Assets 83,688 88,127
Financial Liabilities    
Total Financial Liabilities 0 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 323 336
Other 0 0
Total Financial Assets 323 336
Financial Liabilities    
Total Financial Liabilities $ 11,774 $ 12,896