Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
REVENUE
Commissions	$ 79,409	$ 83,407
Investment Advisory Fee Revenue	73,647	77,548
Investment banking	28,043	28,210
Proceeds from (Payments for) in Interest-bearing Deposits in Banks	33,968	25,297
Interest	12,727	12,227
Principal transactions, net	11,438	2,726
Other	12,538	5,115
Total revenue	251,770	234,530
EXPENSES
Compensation and related expenses	160,355	153,104
Communications and technology	20,086	18,688
Occupancy and equipment costs	15,273	15,428
Clearing and exchange fees	5,332	6,096
Interest	12,986	8,963
Other	21,686	22,630
Total expenses	235,718	224,909
Operating Income (Loss)	16,052	9,621
Income Tax Expense (Benefit)	4,858	2,916
Net Income (Loss) Attributable to Parent	$ 11,194	$ 6,705
Net income per share
Net loss per share (in dollars per share)	$ 0.86	$ 0.51
Earnings Per Share, Diluted [Abstract]
Net loss per share (in dollars per share)	$ 0.81	$ 0.48
Weighted average shares
Basic (in shares)	13,020,344	13,239,628
Diluted (in shares)	13,851,321	13,977,492