Non-Controlling Interests in Consolidated Subsidiaries and Funds (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Interest	$ 160,950		$ 160,950		$ 199,624
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries and investment funds	(4,938)	$ 9,232	13,379	$ (19,843)
Operating Entities
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Interest	124,800		124,800		83,818
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries and investment funds	(4,708)	6,283	17,078	9,514
Consolidated Funds
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Interest	36,150		36,150		$ 115,806
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries and investment funds	$ (230)	$ 2,949	$ (3,699)	$ (29,357)