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Accrued Expenses and Other Accounts Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued Expenses and Other Accounts Payable [Abstract]    
Employees and payroll accruals $ 15,203 $ 11,245
Accrued expenses 6,234 4,955
Government authorities 4,738 2,871
Other 1,614 1,219
Accrued expenses and other accounts payable $ 27,789 $ 20,290