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