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Consolidated Statements of Changes in Equity (Parenthetical) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jul. 01, 2012
Common Stock [Member] |  |
Cash dividend per share | $ 0.50 | $ 0.50
Class B Common Stock [Member] |  |
Cash dividend per share | $ 0.50 | $ 0.50
Class B common stock shares issued | 20,120 | 22,320

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