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Consolidated Condensed Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares | 3 Months Ended
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Apr. 01, 2018 | Apr. 02, 2017
Cash dividend per share | $ 0.25 | $ 0.25
Class B Common Stock [Member] |  |
Cash dividend per share | $ 0.25 | $ 0.25
Class B common stock shares issued | 20,296 | 21,020

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