Non-Controlling Interests in Consolidated Subsidiaries and Funds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	$ 0	$ 391,275
Nonredeemable Noncontrolling Interest	199,624	485,595
Net Income (Loss) Attributable to Noncontrolling Interest	(9,299)	31,239	$ 37,060
Operating Entities
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Interest	83,818	11,513
Net Income (Loss) Attributable to Noncontrolling Interest	19,584	(3,264)	3,177
Consolidated Funds
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	0	391,275
Nonredeemable Noncontrolling Interest	115,806	82,807
Net Income (Loss) Attributable to Noncontrolling Interest	$ (28,883)	$ 34,503	$ 33,883