Investments Of Operating Entities And Consolidated Funds - Operating Entities - Gross And Net Derivative Positions And The Related Offsetting Amount (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Receivable on derivative contracts, at fair value		$ 51,482	$ 62,977
Payable for derivative contracts, at fair value		76,160	60,761
Receivable on derivatives contracts, at fair value [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		113,751	66,217
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1],[2]	62,269	3,240
Receivable on derivative contracts, at fair value		51,482	62,977
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	[2]	691	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	[2]	169	2,911
Derivative asset, net of offset		50,622	60,066
Payable for derivatives contracts, at fair value [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		113,193	64,001
Derivative Liability, Fair Value, Amount Offset Against Collateral	[2]	37,033	3,240
Payable for derivative contracts, at fair value		76,160	60,761
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	[2]	691	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	[2]	3,174	24,020
Derivative Liability, net of offset		$ 72,295	$ 36,741

[1] Derivatives are reported on a net basis, by counterparty, when a legal right of offset exists under an enforceable netting agreement as well as net of cash collateral received or posted under enforceable credit support agreements. See Note 2g for further information on offsetting of derivative financial instruments.

[2] Includes financial instruments subject to enforceable master netting provisions that are permitted to be offset to the extent an event of default has occurred