Segment and geographic information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) region segment	Jun. 30, 2019 USD ($)	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	$ 301,329	$ 334,231	$ 610,709	$ 645,305
Property and equipment, net	247,548		247,548		$ 243,717
Outside The United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	185,000	$ 211,000	377,000	$ 409,000
Property and equipment, net	$ 133,000		$ 133,000		$ 130,000