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Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) (USD $) | 3 Months Ended
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Mar. 31, 2013 | Apr. 01, 2012
Common Stock |  |
Cash dividend per share | $ 0.25 | $ 0.25
Class B Common Stock |  |
Cash dividend per share | $ 0.25 | $ 0.25
Class B common stock shares issued | 20,120 | 22,320

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