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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 27, 2015
Dec. 31, 2014
Treasury stock, shares 5,062,347 4,980,247
Nonvoting Common Stock [Member]    
Common Stock, par value per share $ 1 $ 1
Common Stock, shares authorized 50,000 50,000
Common Stock, shares issued    
Voting Common Stock [Member]    
Common Stock, par value per share $ 1 $ 1
Common Stock, shares authorized 40,000,000 40,000,000
Common Stock, shares issued 23,763,877 23,717,321
Common Stock, shares outstanding 18,701,530 18,737,074