Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Cash dividend per share	$ 0.25	$ 0.25	$ 0.50	$ 0.50
Class B Common Stock [Member]
Cash dividend per share	$ 0.25	$ 0.25	$ 0.50	$ 0.50
Class B common stock shares issued			19,224	20,296