Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues
Revenues	$ 208,576	$ 210,318
Expenses
Employee compensation and benefits	61,916	61,264
Depreciation and amortization	18,236	18,200
Technology and communications	18,048	17,051
Professional and consulting fees	6,410	6,395
Occupancy	3,622	3,425
Marketing and advertising	2,061	1,833
Clearing costs	4,185	4,911
General and administrative	5,716	4,739
Total expenses	120,194	117,818
Operating income	88,382	92,500
Other income (expense)
Interest income	7,169	5,973
Interest expense	(213)	(316)
Equity in earnings of unconsolidated affiliate	289	370
Other, net	527	(1,810)
Total other income (expense)	7,772	4,217
Income before income taxes	96,154	96,717
Provision for income taxes	81,089	24,102
Net income	$ 15,065	$ 72,615
Net income per common share
Basic	$ 0.4	$ 1.92
Diluted	0.4	1.92
Cash dividends declared per common share	$ 0.76	$ 0.74
Weighted average shares outstanding
Basic	37,388	37,740
Diluted	37,456	37,790
Commissions [Member]
Revenues
Revenues	$ 181,343	$ 184,873
Information Services [Member]
Revenues
Revenues	12,904	11,881
Post-trade Services [Member]
Revenues
Revenues	11,088	10,730
Technology Services [Member]
Revenues
Revenues	$ 3,241	$ 2,834