Stock-based compensation - Fair value of vested RSUs and PSUs issued (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards	$ 18,926	$ 9,982	$ 25,702
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards	$ 15,993	$ 1,650	$ 72,615