Investments Of Operating Entities And Consolidated Funds - Consolidated Funds - Indirect Concentration of the Underlying Investments Held by Consolidated Funds (Details) - Equity Securities - Linkem - ITALY - Wireless Broadband - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Percentage of Stockholders' Equity	7.62%	9.07%
Market Value	$ 84,324	$ 87,944