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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares
Mar. 30, 2019
Dec. 31, 2018
Treasury stock, shares 6,665,398 6,665,398
Nonvoting Common Stock [Member]    
Common Stock, par value per share $ 1 $ 1
Common Stock, shares authorized 50,000 50,000
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 24,123,418 24,123,418
Common Stock, shares outstanding 17,458,020 17,458,020