Segment information - Revenue Classified by Major Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	$ 294,111	$ 315,342	$ 797,361	$ 1,028,917
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	279,043	304,726	756,453	987,918
Europe/Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	13,975	9,051	36,426	36,962
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	$ 1,093	$ 1,565	$ 4,482	$ 4,037