Investments Of Operating Entities And Consolidated Funds - Operating Entities - Gross And Net Derivative Positions And The Related Offsetting Amount (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Receivable on derivative contracts, at fair value		$ 95,536	$ 51,482
Payable for derivative contracts, at fair value		52,125	76,160
Receivable on derivatives contracts, at fair value [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		184,774	113,751
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1],[2]	89,238	62,269
Receivable on derivative contracts, at fair value		95,536	51,482
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	[2]	2,694	691
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	[2]	48,448	169
Derivative asset, net of offset		44,394	50,622
Payable for derivatives contracts, at fair value [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		113,931	113,193
Derivative Liability, Fair Value, Amount Offset Against Collateral	[2]	61,806	37,033
Payable for derivative contracts, at fair value		52,125	76,160
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	[2]	2,694	691
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	[2]	1,124	3,174
Derivative Liability, net of offset		$ 48,307	$ 72,295

[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 2f 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