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Segment Geographical Information and Major Customers (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
long-lived assets $ 152,668 $ 150,247
Israel [Member]    
Segment Reporting Information [Line Items]    
long-lived assets 111,217 110,213
Europe [Member]    
Segment Reporting Information [Line Items]    
long-lived assets 1,289 1,302
United States [Member]    
Segment Reporting Information [Line Items]    
long-lived assets 32,223 30,777
Japan [Member]    
Segment Reporting Information [Line Items]    
long-lived assets 5,008 4,887
Other [Member]    
Segment Reporting Information [Line Items]    
long-lived assets $ 2,931 $ 3,068