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General (Details 1) (Parenthetical) - $ / shares
3 Months Ended
Mar. 28, 2019
Mar. 29, 2018
Common Class B [Member]    
Common Stock, Dividends, Per Share, Cash Paid $ 0.15 $ 0.14
Common Stock [Member]    
Common Stock, Dividends, Per Share, Cash Paid $ 0.16 $ 0.15