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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, 2021
Dec. 31, 2020
Financial Assets    
Investments—Consolidated Investment Companies $ 92,798 $ 91,359
Investments—Affiliates and Other 67,292 45,593
Fair Value, Measurements, Recurring    
Financial Assets    
Cash and Cash Equivalents 222,605 301,819
Investments—Consolidated Investment Companies 92,798 91,359
Investments—Affiliates and Other 67,292 45,593
Other 13,168 14,331
Total Financial Assets 395,863 453,102
Financial Liabilities    
Total Financial Liabilities 11,640 12,985
Fair Value, Measurements, Recurring | Level 1    
Financial Assets    
Cash and Cash Equivalents 222,605 301,819
Investments—Consolidated Investment Companies 15,421 13,622
Investments—Affiliates and Other 61,715 40,010
Other 9,272 9,188
Total Financial Assets 309,013 364,639
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 77,377 77,737
Investments—Affiliates and Other 5,254 5,247
Other 3,896 5,143
Total Financial Assets 86,527 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 $ 11,640 $ 12,896