CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interest in consolidated subsidiaries
Beginning balance at Dec. 26, 2015	$ 965,211	$ 27,900	$ 0	$ 1,729,679	$ (267,218)	$ (571,920)	$ 46,770
Increase (Decrease) in Shareholders' Equity
Net earnings	107,134			103,168			3,966
Other comprehensive income (loss)	3,015				1,249		1,766
Cash dividends declared	(25,482)			(25,482)			0
Dividends to noncontrolling interests	(2,527)						(2,527)
Purchase of noncontrolling interests	(11,009)		(137)				(10,872)
Purchase of treasury shares	(46,581)					(46,581)
Stock plan exercises	(1,453)					(1,453)
Stock options exercised	6,509		(6,435)	4,582		8,362
Stock option expense	4,358		4,358
Stock awards	3,126		2,214			912
Ending balance at Sep. 24, 2016	1,002,301	27,900	0	1,811,947	(265,969)	(610,680)	39,103
Beginning balance at Dec. 31, 2016	982,586	27,900	0	1,874,722	(346,359)	(612,781)	39,104
Increase (Decrease) in Shareholders' Equity
Net earnings	123,949			119,851			4,098
Other comprehensive income (loss)	58,711				58,257		454
Cash dividends declared	(25,417)			(25,417)			0
Dividends to noncontrolling interests	(3,895)						(3,895)
Stock plan exercises	(3,929)					(3,929)
Stock options exercised	12,446		(7,300)	5,445		14,301
Stock option expense	3,868		3,868
Stock awards	4,276		3,432			844
Ending balance at Sep. 30, 2017	$ 1,152,595	$ 27,900	$ 0	$ 1,974,601	$ (288,102)	$ (601,565)	$ 39,761