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Fair Value Measurements - Classes of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financial Assets    
Cash and Cash Equivalents $ 308,349 $ 249,174
Investments—Consolidated Investment Companies    
Equity Securities 18,435 25,628
Debt Securities 28,727 38,898
Investments—Affiliates and Other    
Equity Securities 20,768 24,014
Debt Securities 4,731 2,921
Other 8,910 6,078
Total Financial Assets 389,920 346,713
Financial Liabilities    
Total Financial Liabilities 13,700 2,087
Level 1    
Financial Assets    
Cash and Cash Equivalents 308,349 249,174
Investments—Consolidated Investment Companies    
Equity Securities 6,266 7,245
Debt Securities 0 0
Investments—Affiliates and Other    
Equity Securities 20,662 23,667
Debt Securities 0 0
Other 8,666 2,901
Total Financial Assets 343,943 282,987
Financial Liabilities    
Total Financial Liabilities 557 6
Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies    
Equity Securities 12,169 18,383
Debt Securities 28,727 38,898
Investments—Affiliates and Other    
Equity Securities 75 335
Debt Securities 4,431 2,610
Other 244 3,177
Total Financial Assets 45,646 63,403
Financial Liabilities    
Total Financial Liabilities 1,418 0
Level 3    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies    
Equity Securities 0 0
Debt Securities 0 0
Investments—Affiliates and Other    
Equity Securities 31 12
Debt Securities 300 311
Other 0 0
Total Financial Assets 331 323
Financial Liabilities    
Total Financial Liabilities $ 11,725 $ 2,081