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Segment Information - Reported Revenue and Profit Before Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue
Total revenue		$ (422,908)	$ (276,259)	$ (264,730)	$ (234,770)	$ (295,881)	$ (234,793)	$ (250,935)	$ (251,770)	$ (1,198,667)	$ (1,033,379)	$ (958,154)
Income (loss) before income taxes
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest										169,000	74,912	44,869
Asset Management
Revenue
Total revenue	[1]									(130,274)	(88,755)	(71,696)
Income (loss) before income taxes
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	[1]									$ 71,625	$ 31,606	$ 18,590
Asset management fees										10.00%	10.00%	10.00%
Private Client Division
Revenue
Total revenue	[1]									$ (642,083)	$ (653,409)	$ (617,871)
Income (loss) before income taxes
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	[1]									$ 122,844	$ 163,917	$ 149,097
Asset management fees										90.00%	90.00%	90.00%
Capital markets
Revenue
Total revenue										$ (426,752)	$ (290,830)	$ (272,719)
Income (loss) before income taxes
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest										83,442	(13,724)	(13,416)
Corporate/Other
Revenue
Total revenue										442	(385)	4,132
Income (loss) before income taxes
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest										$ (108,911)	$ (106,887)	$ (109,402)
[1] (1) Clients investing in the OAM advisory program are charged fees based on the value of AUM. Advisory fees were allocated 10.0% to the Asset Management and 90.0% to the Private Client segments.

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