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Schedule of Tangible Long-Lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets    
Long-lived Assets $ 867,972 $ 811,576
United States    
Revenues from External Customers and Long-Lived Assets    
Long-lived Assets 547,536 531,425
United Kingdom    
Revenues from External Customers and Long-Lived Assets    
Long-lived Assets 178,583 159,689
Other countries    
Revenues from External Customers and Long-Lived Assets    
Long-lived Assets $ 141,853 $ 120,462