Summary of significant accounting policies - Contract Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Contract With Customer, Liability [Roll Forward]
Balance, beginning of the period	$ 316,952	$ 238,457	$ 282,128	$ 205,509
Acquisitions	0	5,200	0	5,200
Revenue earned	(96,542)	(71,574)	(199,357)	(144,038)
Deferral of revenue	120,820	98,284	258,459	203,696
Balance, end of the period	$ 341,230	$ 270,367	$ 341,230	$ 270,367