Breakdown of Revenue and Non-Current Assets by Geographical Areas - Revenue by Significant Other Countries (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 470,345	$ 522,606	$ 1,411,335	$ 1,608,876
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	185,547	192,954	528,453	581,560
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	39,246	45,972	129,485	146,565
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	21,597	19,337	63,274	62,285
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 68,459	$ 83,174	$ 220,878	$ 285,605