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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, 2021
Dec. 31, 2020
Financial Assets    
Investments—Consolidated Investment Companies $ 54,075 $ 91,359
Investments—Affiliates and Other 89,318 45,593
Fair Value, Measurements, Recurring    
Financial Assets    
Cash and Cash Equivalents 201,692 301,819
Investments—Consolidated Investment Companies 54,075 91,359
Investments—Affiliates and Other 89,318 45,593
Other 7,097 14,331
Total Financial Assets 352,182 453,102
Financial Liabilities    
Total Financial Liabilities 14,026 12,985
Fair Value, Measurements, Recurring | Level 1    
Financial Assets    
Cash and Cash Equivalents 201,692 301,819
Investments—Consolidated Investment Companies 28,955 13,622
Investments—Affiliates and Other 83,656 40,010
Other 7,095 9,188
Total Financial Assets 321,398 364,639
Financial Liabilities    
Total Financial Liabilities 71 0
Fair Value, Measurements, Recurring | Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies 25,120 77,737
Investments—Affiliates and Other 5,343 5,247
Other 2 5,143
Total Financial Assets 30,465 88,127
Financial Liabilities    
Total Financial Liabilities 2,099 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 319 336
Other 0 0
Total Financial Assets 319 336
Financial Liabilities    
Total Financial Liabilities $ 11,856 $ 12,896