Basis of presentation - Schedule of Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest Income	$ 1,011	$ 2,023	$ 3,310	$ 4,257
Net foreign currency loss	(838)	(1,611)	(1,343)	(1,245)
Other	(1,316)	143	(2,550)	119
Other (expense) income, net	$ (1,143)	$ 555	$ (583)	$ 3,131