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Consolidated BALANCE SHEETS (Parenthetical) - $ / shares
shares in Thousands
Dec. 31, 2015
Dec. 31, 2014
Stockholders' equity    
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) 28,486 28,327
Treasury Stock, common stock shares (in shares) 8,362 7,759
Convertible Class A Common Stock [Member]    
Stockholders' equity    
Common Stock, shares authorized (in shares) 15,000 15,000
Common Stock, shares issued (in shares) 2,554 2,603
Treasury Stock, common stock shares (in shares) 522 522