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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
Dec. 31, 2019
Dec. 31, 2018
Financial Assets    
Cash and Cash Equivalents $ 249,174 $ 156,832
Investments—Consolidated Investment Companies    
Equity Securities 25,628 1,902
Debt Securities 38,898 20,896
Investments—Affiliates and Other    
Equity Securities 24,014 7,404
Debt Securities 2,921 3,456
Other 6,078 667
Total Financial Assets 346,713 191,157
Total Financial Liabilities 2,087 4,290
Level 1    
Financial Assets    
Cash and Cash Equivalents 249,174 156,832
Investments—Consolidated Investment Companies    
Equity Securities 7,245 1,269
Debt Securities 0 0
Investments—Affiliates and Other    
Equity Securities 23,667 6,963
Debt Securities 0 0
Other 2,901 597
Total Financial Assets 282,987 165,661
Total Financial Liabilities 6 53
Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies    
Equity Securities 18,383 633
Debt Securities 38,898 20,896
Investments—Affiliates and Other    
Equity Securities 335 403
Debt Securities 2,610 3,456
Other 3,177 0
Total Financial Assets 63,403 25,388
Total Financial Liabilities 0 3,852
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 12 38
Debt Securities 311 0
Other 0 70
Total Financial Assets 323 108
Total Financial Liabilities $ 2,081 $ 385