Non-Controlling Interests in Consolidated Subsidiaries and Funds (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	$ 0		$ 0		$ 391,275
Nonredeemable Noncontrolling Interest	188,925		188,925		485,595
Net Income (Loss) Attributable to Noncontrolling Interest	33,113	$ 3,906	(29,075)	$ 4,418
Operating Entities
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Interest	60,726		60,726		11,513
Net Income (Loss) Attributable to Noncontrolling Interest	3,104	428	3,231	540
Consolidated Funds
Noncontrolling Interest [Line Items]
Redeemable non-controlling interests in consolidated subsidiaries and funds	0		0		391,275
Nonredeemable Noncontrolling Interest	128,199		128,199		$ 82,807
Net Income (Loss) Attributable to Noncontrolling Interest	$ 30,009	$ 3,478	$ (32,306)	$ 3,878