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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 697 $ 1,028
Accumulated amortization $ 2,184 $ 1,471
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 25,000,000 25,000,000
Common stock, shares issued (in shares) 12,074,661 12,043,673
Treasury stock, shares (in shares) 5,864,641 5,879,163