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Interim Condensed Consolidated Statements of Financial Position (Parenthetical)
$ in Thousands
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2018
₪ / shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
₪ / shares
Statement of Financial Position [Line Items]        
Allowances for doubtful accounts | $ $ 6,445   $ 6,051  
Ordinary share, authorized 25,000,000   25,000,000  
Ordinary shares, issued 15,308,381   15,307,402  
Ordinary shares, outstanding 14,739,761   14,738,782  
Number of treasury shares outstanding 568,620   568,620  
NIS [Member]        
Statement of Financial Position [Line Items]        
Ordinary shares par value | ₪ / shares   ₪ 1   ₪ 1