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Segment and Geographic Information Schedule of Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets    
Revenue $ 2,720,764 $ 2,342,843
UNITED STATES    
Revenues from External Customers and Long-Lived Assets    
Revenue 1,560,027 1,417,040
UNITED KINGDOM    
Revenues from External Customers and Long-Lived Assets    
Revenue 430,992 382,652
Other countries    
Revenues from External Customers and Long-Lived Assets    
Revenue $ 729,745 $ 543,151