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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 27, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Trade accounts receivable allowance for doubtful accounts $ 302 $ 300
Preferred stock - par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock - shares authorized 1,000,000 1,000,000
Preferred stock - shares issued 0 0
Preferred stock - shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock - shares authorized 40,000,000 40,000,000
Common stock - shares issued 19,185,899 19,181,815
Common stock - shares outstanding 15,326,239 15,322,155
Treasury stock - shares 3,859,660 3,859,660