Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Addl. Paid in Capital	Treasury Stock	Accum. Other Comp. Inc. (Loss)	Retained Earnings	Non- controlling Interest
Balance at Dec. 30, 2017	$ 927,556	$ 229	$ 310,012	$ (41,294)	$ (63,668)	$ 722,140	$ 137
Net income	36,029					36,029
Pension and postemployment adjustment, net of tax	(3)				(3)
Unrealized gain (loss) on investments					(9,795)	9,795
Foreign currency translation adjustments	(276)				(276)
Other comprehensive income, net of tax	(279)				(10,074)	9,795
Stock-based compensation	8,714		8,714
Withheld shares on restricted share units for withholding taxes	(2,758)			(2,758)
Stock options exercised	9,609		9,609
Issuance of common stock	472,301	22	472,279
Cash dividends paid	(9,198)					(9,198)
Balance at Mar. 31, 2018	1,441,974	251	800,614	(44,052)	(73,742)	758,766	137
Balance at Dec. 29, 2018	1,478,342	254	835,828	(116,454)	(97,924)	856,507	131
Net income	36,989					36,989
Pension and postemployment adjustment, net of tax	(49)				(49)
Foreign currency translation adjustments	8,122				8,122
Other comprehensive income, net of tax	8,073				8,073
Stock-based compensation	3,966		3,966
Withheld shares on restricted share units for withholding taxes	(94)			(94)
Stock options exercised	2,292		2,292
Repurchases of common stock	(13,555)			(13,555)
Cash dividends paid	(10,625)					(10,625)
Balance at Mar. 30, 2019	$ 1,505,388	$ 254	$ 842,086	$ (130,103)	$ (89,851)	$ 882,871	$ 131