Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues
Revenues	$ 197,660	$ 179,846	$ 407,978	$ 383,015
Expenses
Employee compensation and benefits	56,790	48,383	118,054	100,698
Depreciation and amortization	18,356	17,005	36,556	33,466
Technology and communications	17,771	15,235	34,822	30,234
Professional and consulting fees	7,669	8,023	14,064	15,150
Occupancy	3,714	3,199	7,139	6,810
Marketing and advertising	3,010	3,308	4,843	6,303
Clearing costs	4,122	4,182	9,033	8,727
General and administrative	4,889	4,784	9,628	10,544
Total expenses	116,321	104,119	234,139	211,932
Operating income	81,339	75,727	173,839	171,083
Other income (expense)
Interest income	6,401	5,312	12,374	9,561
Interest expense	(621)	(53)	(937)	(183)
Equity in earnings of unconsolidated affiliate	354	250	724	454
Other, net	(1,136)	(2,286)	(2,946)	(3,770)
Total other income (expense)	4,998	3,223	9,215	6,062
Income before income taxes	86,337	78,950	183,054	177,145
Provision for income taxes	21,399	19,091	45,501	43,658
Net income	$ 64,938	$ 59,859	$ 137,553	$ 133,487
Net income per common share
Basic	$ 1.72	$ 1.6	$ 3.65	$ 3.56
Diluted	1.72	1.59	3.64	3.55
Cash dividends declared per common share	$ 0.74	$ 0.72	$ 1.48	$ 1.44
Weighted average shares outstanding
Basic	37,655	37,485	37,698	37,482
Diluted	37,689	37,588	37,740	37,617
Commissions [Member]
Revenues
Revenues	$ 171,679	$ 158,586	$ 356,552	$ 340,577
Information Services [Member]
Revenues
Revenues	12,544	11,655	24,425	22,665
Post-trade Services [Member]
Revenues
Revenues	10,400	9,415	21,130	19,395
Technology Services [Member]
Revenues
Revenues	$ 3,037	$ 190	$ 5,871	$ 378