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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accounts receivable, less allowances $ 2,499 $ 2,370
Common stock, par value $ 2 $ 2
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 5,391,671 5,397,138
Common stock, shares outstanding 5,391,671 5,397,138
Treasury shares, at par 827,211 819,424
Common stock, shares issued to rabbi trust 290,470 292,609