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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts $ 1,593 $ 1,258
Common stock, par value $ 1.50 $ 1.50
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 24,934,981 24,934,981
Treasury stock, shares 4,771,443 4,842,621