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Employees' Rights upon Retirement (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Employees' Rights upon Retirement [Abstract]    
Accrued severance pay $ 1,687 $ 1,786
Less - amounts funded (presented in ''investment and other non-current assets'') (1,565) (1,623)
Unfunded balance $ 122 $ 163