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Geographic areas and major customers (Schedule of Locations of Company's Long Lived Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets $ 32,400 $ 34,550
North America [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets 16 22
Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets 12,945 13,588
Israel [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets 19,439 20,894
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long lived assets $ 46