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Segment and Geographic Data (Property and Equipment, Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 59,419 $ 55,674
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 10,933 11,932
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 3,960 4,385
Other Europe    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 1,430 1,427
Israel    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 22,682 18,895
Asia    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 19,090 18,100
Canada and Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 1,324 $ 935