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Cash and Cash Equivalents (Currencies) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Dec. 31, 2015
 [1]
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 54,935 $ 43,744 $ 19,740 $ 30,833
U.S. Dollars [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 49,678 36,636    
New Israeli Shekels [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 2,790 1,122    
Euro [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 1,486 3,603    
Other Currencies [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 981 $ 2,383    
[1] Reclassified - due to presenting PCB operation as discontinued operation - See Note 19