Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenues
Revenues	$ 218,415	$ 219,462	$ 451,795	$ 428,038
Expenses
Employee compensation and benefits	62,182	65,237	132,377	127,153
Depreciation and amortization	19,309	19,195	38,519	37,431
Technology and communications	21,508	19,421	41,868	37,469
Professional and consulting fees	7,973	7,190	14,349	13,600
Occupancy	3,982	3,753	7,801	7,375
Marketing and advertising	3,442	2,952	5,776	5,013
Clearing costs	4,359	4,447	8,785	8,632
General and administrative	5,783	5,403	11,522	11,119
Total expenses	128,538	127,598	260,997	247,792
Operating income	89,877	91,864	190,798	180,246
Other income (expense)
Interest income	4,692	5,930	9,000	13,099
Interest expense	(1,862)	(139)	(4,750)	(352)
Equity in earnings of unconsolidated affiliate	0	168	0	457
Other, net	(2,945)	(407)	(1,401)	120
Total other income (expense)	(115)	5,552	2,849	13,324
Income before income taxes	89,762	97,416	193,647	193,570
Provision for income taxes	21,439	26,236	47,217	107,325
Net income	68,323	71,180	146,430	86,245
Less: income attributable to redeemable noncontrolling interest	(218)	(31)	(443)	(31)
Net income available for common stockholders	$ 68,105	$ 71,149	$ 145,987	$ 86,214
Net income per common share
Basic	$ 1.93	$ 1.91	$ 4.14	$ 2.31
Diluted	1.93	1.91	4.13	2.31
Cash dividends declared per common share	$ 0.78	$ 0.76	$ 1.56	$ 1.52
Weighted average shares outstanding
Basic	35,203	37,210	35,252	37,299
Diluted	35,242	37,298	35,314	37,377
Commissions [Member]
Revenues
Revenues	$ 186,895	$ 191,770	$ 390,366	$ 373,113
Information Services [Member]
Revenues
Revenues	16,094	13,087	30,539	25,991
Post-trade Services [Member]
Revenues
Revenues	11,598	11,076	23,205	22,164
Technology Services [Member]
Revenues
Revenues	$ 3,828	$ 3,529	$ 7,685	$ 6,770