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Schedule of Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets        
Revenue $ 2,465,800 $ 2,207,343 $ 7,267,054 $ 6,433,625
United States        
Revenues from External Customers and Long-Lived Assets        
Revenue 1,395,495 1,336,851 4,268,600 3,997,525
United Kingdom        
Revenues from External Customers and Long-Lived Assets        
Revenue 399,155 336,168 1,171,829 1,044,110
Other countries        
Revenues from External Customers and Long-Lived Assets        
Revenue $ 671,150 $ 534,324 $ 1,826,625 $ 1,391,990