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Schedule of Tangible Long-Lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets    
Long-lived Assets $ 929,756 $ 913,089
UNITED STATES    
Revenues from External Customers and Long-Lived Assets    
Long-lived Assets 589,848 583,236
UNITED KINGDOM    
Revenues from External Customers and Long-Lived Assets    
Long-lived Assets 186,347 178,021
Other countries    
Revenues from External Customers and Long-Lived Assets    
Long-lived Assets $ 153,561 $ 151,832