CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Net income	$ 86,974	$ 85,221
Other comprehensive income, net of tax:
Foreign currency translation adjustment, net of tax of $0, $0, respectively	10,541	8,963
Available-for-sale marketable securities:
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(718), $420, respectively	(2,687)	513
Less: Reclassification adjustment for losses (gains) included in net income, net of tax of $78, $(64), respectively	1,668	(95)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	(1,019)	418
Defined benefit pension and post-retirement plans:
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax of $(18), $(38), respectively	(61)	(68)
Other comprehensive income (loss)	9,461	9,313
Comprehensive income	$ 96,435	$ 94,534