Employee Retirement Plans Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 29, 2019 USD ($) plan	Jun. 30, 2018 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost, Other Components	$ 7,297	$ 9,116	$ 15,058	$ 18,821
Number of defined contribution 401K savings plans | plan			2
Non-US Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(16,832)	(18,895)	$ (33,830)	(38,173)
Defined Benefit Plan, Service Cost	620	957	1,246	1,934
Defined Benefit Plan, Interest Cost	8,349	8,113	16,781	16,391
Defined Benefit Plan, Amortization of Gain (Loss)	156	1,012	313	2,044
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	642	0	1,290	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	388	677	388	964
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0	(23)	0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement				(47)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (6,677)	$ (8,159)	$ (13,812)	$ (16,887)