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Consolidated BALANCE SHEETS (Parenthetical) - $ / shares
shares in Thousands
Dec. 31, 2017
Dec. 31, 2016
Stockholders' equity    
Preferred Stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, shares authorized (in shares) 1,000 1,000
Preferred Stock, shares issued (in shares) 0 0
Common Stock, par value (in dollars per share) $ 1 $ 1
Common Stock [Member]    
Stockholders' equity    
Common Stock, shares authorized (in shares) 50,000 50,000
Common Stock, shares issued (in shares) 28,950 28,793
Treasury Stock, common stock shares (in shares) 9,498 9,506
Convertible Class A Common Stock [Member]    
Stockholders' equity    
Common Stock, shares authorized (in shares) 15,000 15,000
Common Stock, shares issued (in shares) 2,290 2,340
Treasury Stock, common stock shares (in shares) 522 522