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Other Accounts Receivable and Prepaid Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Accounts Receivable and Prepaid Expenses [Abstract]    
Prepaid expenses $ 2,659 $ 2,601
Government authorities 4,900 3,426
Related parties 314 1,603
Other 770 857
Other accounts receivable and prepaid expenses $ 8,643 $ 8,487