Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues
Revenues	$ 208,821	$ 206,715	$ 636,859	$ 614,693
Expenses
Employee compensation and benefits	59,982	58,431	187,135	176,485
Depreciation and amortization	19,662	18,728	57,093	55,284
Technology and communications	19,961	18,553	57,430	53,375
Professional and consulting fees	7,382	6,989	20,982	21,053
Occupancy	3,859	3,835	11,234	10,974
Marketing and advertising	2,349	2,898	7,362	7,741
Clearing costs	3,948	4,387	12,580	13,420
General and administrative	6,099	5,839	17,218	15,467
Total expenses	123,242	119,660	371,034	353,799
Operating income	85,579	87,055	265,825	260,894
Other income (expense)
Interest income	5,850	6,953	18,949	19,327
Interest expense	(171)	(346)	(523)	(1,283)
Equity in earnings of unconsolidated affiliate	0	340	457	1,064
Other, net	2,381	(1,105)	2,501	(4,051)
Total other income (expense)	8,060	5,842	21,384	15,057
Income before income taxes	93,639	92,897	287,209	275,951
Provision for income taxes	25,366	21,408	132,691	66,909
Net income	68,273	71,489	154,518	209,042
Less: income attributable to redeemable noncontrolling interest	(97)	0	(128)	0
Net income available for common stockholders	$ 68,176	$ 71,489	$ 154,390	$ 209,042
Net income per common share
Basic	$ 1.84	$ 1.9	$ 4.15	$ 5.55
Diluted	1.84	1.9	4.14	5.55
Cash dividends declared per common share	$ 0.76	$ 0.74	$ 2.28	$ 2.22
Weighted average shares outstanding
Basic	37,023	37,527	37,207	37,641
Diluted	37,109	37,608	37,288	37,696
Commissions [Member]
Revenues
Revenues	$ 180,171	$ 180,392	$ 553,284	$ 536,944
Information Services [Member]
Revenues
Revenues	13,785	12,960	39,776	37,385
Post-trade Services [Member]
Revenues
Revenues	11,293	10,382	33,457	31,512
Technology Services [Member]
Revenues
Revenues	$ 3,572	$ 2,981	$ 10,342	$ 8,852