Employee Benefit Plans (Components of Net Periodic Benefit Cost (Credit)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer			$ 4,100	$ 5,200
Defined Benefit Pension Benefits [Member]
Components of net periodic benefit cost (credit)
Service cost	$ 1,222	$ 1,096	2,436	2,188
Interest cost	4,133	4,727	8,260	9,457
Expected return on plan assets	(6,541)	(6,174)	(13,041)	(12,362)
Amortization of prior service	(48)	(55)	(95)	(109)
Net periodic benefit cost (credit)	(1,234)	(406)	(2,440)	(826)
Postretirement Medical Benefits [Member]
Components of net periodic benefit cost (credit)
Service cost	23	25	46	50
Interest cost	31	36	62	72
Expected return on plan assets	(278)	(259)	(557)	(518)
Amortization of prior service	0	0	0	0
Net periodic benefit cost (credit)	$ (224)	$ (198)	$ (449)	$ (396)