Segment Information - Reported Revenue and Profit Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue
Total revenue	$ (251,770)	$ (234,530)
Income (loss) before income taxes
Operating Income (Loss)	16,052	9,621
Private Client Division
Revenue
Total revenue	(163,527)	(154,094)
Income (loss) before income taxes
Income before income taxes	$ 42,834	40,162
Asset management fees	90.00%
Asset Management
Revenue
Total revenue	$ (16,586)	(17,644)
Income (loss) before income taxes
Income before income taxes	$ 2,242	3,718
Asset management fees	10.00%
Capital markets
Revenue
Total revenue	$ (70,961)	(61,529)
Income (loss) before income taxes
Income before income taxes	(2,647)	(6,057)
Corporate/Other
Revenue
Total revenue	(696)	(1,263)
Income (loss) before income taxes
Income before income taxes	$ (26,377)	$ (28,202)