Segment and geographic information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) region segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | segment			1
Number of geographic regions company operates in | region			3
Total revenue	$ 308,124	$ 340,442	$ 918,834	$ 985,747
Property and equipment, net	253,073		253,073		$ 243,717
Outside The United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	187,000	$ 208,000	564,000	$ 617,000
Property and equipment, net	$ 135,000		$ 135,000		$ 130,000