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Segment Geographical Information and Major Customers (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Long-lived assets $ 139,557 $ 152,668
Israel [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets 100,206 111,217
United States [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets 30,222 32,223
Japan [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets 5,082 5,008
Others [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets 2,800 2,931
Europe [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets $ 1,247 $ 1,289