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Selected Statements of Income Data (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Selected Statements of Income Data [Abstract]      
Bank charges and interest from loans offset by interest from short term deposits $ (1,124) $ (199) $ 64
Interest expenses related to liabilities in connection with acquisitions (62) (257)
Interest income from marketable securities, net of amortization of premium on marketable securities 284 240 231
Loss arising from foreign currency translation and other (809) (214) (980)
Financial income(expenses), net $ 1,711 $ 430 $ 685