Employee Retirement Plans Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 29, 2018 USD ($) plan	Sep. 30, 2017 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost, Other Components	$ 9,225	$ 8,813	$ 28,046	$ 25,763
Number of defined contribution 401K savings plans | plan			2
Non-US Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(18,062)	(17,728)	$ (56,235)	(51,825)
Defined Benefit Plan, Service Cost	915	1,019	2,849	2,979
Defined Benefit Plan, Interest Cost	7,756	8,205	24,147	23,986
Defined Benefit Plan, Amortization of Gain (Loss)	967	761	3,011	2,224
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	136	0	1,100	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(22)	(51)	(69)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement				148
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (8,310)	$ (7,794)	$ (25,197)	$ (22,784)