Breakdown of Revenue and Non-Current Assets by Geographical Areas - Revenue by Significant Other Countries (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 437,614	$ 528,147	$ 940,990	$ 1,086,270
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	169,879	192,815	342,906	388,606
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	39,621	46,998	90,239	100,593
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	20,857	21,180	41,677	42,948
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 67,782	$ 82,263	$ 152,419	$ 175,431