Income taxes - Schedule of Current and Deferred Income Tax (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
U.S. federal tax	$ 47,880	$ 17,794	$ 9,502
State and local tax	18,331	6,498	2,289
Non-U.S. operations	258	386	290
Total Current	66,469	24,678	12,081
Deferred:
U.S. federal tax	(1,745)	17,182	7,177
State and local tax	790	4,310	2,924
Non-U.S. operations	163	(156)	(223)
Total Deferred	(792)	21,336	9,878
Total income taxes	$ 65,677	$ 46,014	$ 21,959