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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 528,869 $ 563,973 $ 1,630,218 $ 1,622,661
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 186,366 198,342 559,786 578,806
Germany        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 47,460 48,318 150,607 132,814
United Kingdom        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 22,109 28,352 70,887 82,971
Japan        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 83,792 $ 94,103 $ 260,116 $ 266,813