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. 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 options exercised	12,446		(7,300)	5,445		14,301
Stock plan exercises	(3,929)					(3,929)
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
Increase (Decrease) in Shareholders' Equity
Cumulative impact of ASC 606 adoption | Accounting Standards Update 2014-09	9,771			9,771
Cumulative impact of ASC 606 adoption | Accounting Standards Update 2016-16	1,038			1,038
Beginning balance at Dec. 30, 2017	1,151,795	27,900	0	1,954,344	(279,022)	(590,386)	38,959
Increase (Decrease) in Shareholders' Equity
Net earnings	82,151			76,689			5,462
Other comprehensive income (loss)	(40,744)				(43,532)		2,788
Cash dividends declared	(25,204)			(25,204)			0
Dividends to noncontrolling interests	(5,737)						(5,737)
Stock options exercised	6,376		(7,172)	5,900		7,648
Purchase of noncontrolling interests	(5,510)						(5,510)
Addition of noncontrolling interest	40,569						40,569
Purchase of treasury shares	(86,919)					(86,919)
Stock plan exercises	(1,914)					(1,914)
Stock option expense	3,138		3,138
Stock awards	4,938		4,034			904
Ending balance at Sep. 29, 2018	$ 1,133,748	$ 27,900	$ 0	$ 2,022,538	$ (322,554)	$ (670,667)	$ 76,531