Income taxes - Schedule of Activity Related to Unrecognized Tax Benefits, Excluding Federal Tax Benefit of State Tax Deductions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in unrecognized tax benefits
Balance at beginning of year	$ 6,645	$ 7,725	$ 8,196
Additions based on tax positions related to the current year	123	0	0
Additions for tax positions of prior years	123	151	0
Reductions of tax positions of prior years	(378)	(680)	0
Settlements	(1,710)	0	(9)
Reductions due to lapse of statutes of limitations	(567)	(551)	(462)
Balance as of end of year	$ 4,236	$ 6,645	$ 7,725