Employee Retirement Plans Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019 USD ($)	Sep. 29, 2018 USD ($)	Sep. 28, 2019 USD ($) plan	Sep. 29, 2018 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost, Other Components	$ 7,175	$ 9,225	$ 22,233	$ 28,046
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]
Service cost	593	915	$ 1,839	2,849
Interest cost	7,995	7,756	24,776	24,147
Expected return on assets	(16,118)	(18,062)	(49,948)	(56,235)
Amortization of net (gain) loss	149	967	462	3,011
Amortization of prior service cost (credit)	614	0	1,904	0
Curtailment loss (gain)	185	136	573	1,100
Pension settlement gain	0	(22)	0	(69)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (6,582)	$ (8,310)	$ (20,394)	$ (25,197)