Income taxes - Schedule of Provision (Benefit) for Income Taxes on Income Consists (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
Federal	$ 96,816	$ 161,438	$ 114,255
State and other	13,646	23,456	11,310
Total	110,462	184,894	125,565
Deferred
Federal	14,240	13,435	15,400
State and other	5,497	4,041	(5,484)
Total	19,737	17,476	9,916
Total
Federal	111,056	174,873	129,655
State and other	19,143	27,497	5,826
Total	$ 130,199	$ 202,370	$ 135,481