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Segment and Geographic Information Schedule of Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets    
Revenue $ 3,100,303 $ 2,720,764
UNITED STATES    
Revenues from External Customers and Long-Lived Assets    
Revenue 1,542,026 1,560,027
UNITED KINGDOM    
Revenues from External Customers and Long-Lived Assets    
Revenue 412,813 430,992
GERMANY    
Revenues from External Customers and Long-Lived Assets    
Revenue 386,465 803
Other countries    
Revenues from External Customers and Long-Lived Assets    
Revenue $ 758,999 $ 728,942