Investments Of Operating Entities And Consolidated Funds - Consolidated Funds - Other Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Portfolio Funds, Consolidated Funds	$ 149,689	$ 175,769
Enterprise LP [Member]
Investment Holdings [Line Items]
Portfolio Funds, Consolidated Funds	88,675	99,153
Merger Fund [Member]
Investment Holdings [Line Items]
Portfolio Funds, Consolidated Funds	$ 61,014	$ 76,616