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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, 2019
Dec. 31, 2018
Financial Assets    
Cash and Cash Equivalents $ 134,485 $ 156,832
Investments—Consolidated Investment Companies    
Equity Securities 1,739 1,902
Debt Securities 13,854 20,896
Investments—Affiliates and Other    
Equity Securities 8,205 7,404
Debt Securities 3,828 3,456
Other 697 667
Total Financial Assets 162,808 191,157
Total Financial Liabilities 1,367 4,290
Level 1    
Financial Assets    
Cash and Cash Equivalents 134,485 156,832
Investments—Consolidated Investment Companies    
Equity Securities 1,018 1,269
Debt Securities 0 0
Investments—Affiliates and Other    
Equity Securities 7,697 6,684
Debt Securities 0 0
Other 627 597
Total Financial Assets 143,827 165,382
Total Financial Liabilities 14 53
Level 2    
Financial Assets    
Cash and Cash Equivalents 0 0
Investments—Consolidated Investment Companies    
Equity Securities 721 633
Debt Securities 13,854 20,896
Investments—Affiliates and Other    
Equity Securities 120 403
Debt Securities 3,527 3,456
Other 0 0
Total Financial Assets 18,222 25,388
Total Financial Liabilities 782 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 41 38
Debt Securities 301 0
Other 70 70
Total Financial Assets 412 108
Total Financial Liabilities 571 385
NAV Practical Expedient    
Investments—Affiliates and Other    
Equity Securities 347 279
Total Financial Assets $ 347 $ 279