Income taxes - Schedule of Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amount
U.S. federal statutory income tax	$ 22,194	$ 9,806	$ 9,497
U.S. state and local income taxes, net of U.S. federal income tax benefits	6,837	4,150	3,110
Unrecognized tax benefit	15	45	180
Valuation allowance	2,079	964	1,054
Non-taxable income	(1,094)	(964)	(1,083)
Provision to return adjustments	(95)	(812)	(316)
Change in state and foreign tax rates	451	(514)	(660)
Foreign tax rate differentials	(339)	(146)	(285)
Excess tax benefits from share-based awards	(647)	(1,378)	(471)
Non-deductible executive compensation	2,747	1,514	1,605
Other non-deductible expenses	2,362	3,833	813
Total income taxes	$ 34,510	$ 16,498	$ 13,444
Percentage
U.S. federal statutory income tax rate (as a percent)	21.00%	21.00%	21.00%
U.S. state and local income taxes, net of U.S. federal income tax benefits (as a percent)	6.50%	8.90%	6.80%
Unrecognized tax benefits (as a percent)	0.00%	0.10%	0.40%
Valuation allowance (as a percent)	2.00%	2.10%	2.30%
Non-taxable income (as a percent)	(1.00%)	(2.10%)	(2.40%)
Provision to return adjustments (as a percent)	(0.10%)	(1.70%)	(0.70%)
Change in state and foreign tax rates (as a percent)	0.40%	(1.10%)	(1.40%)
Foreign tax rate differentials (as a percent)	(0.30%)	(0.30%)	(0.60%)
Excess tax benefits from share-based awards (as a percent)	(0.60%)	(2.90%)	(1.00%)
Non-Deductible Executive Compensation (as a percent)	2.60%	3.20%	3.50%
Other non-deductible expenses (as a percent)	2.10%	8.10%	1.60%
Total income tax expense (as a percent)	32.60%	35.30%	29.50%