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Investments - Summary of Other Equity Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment $ 58,819 $ 58,507
ABS [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment 39,787 38,699
Atalanta Sosnoff [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment 12,858 13,291
Luminis [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment $ 6,174 $ 6,517