Employee Retirement Plans Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Oct. 01, 2016 USD ($)	Sep. 30, 2017 USD ($) plan	Oct. 01, 2016 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
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	$ (17,728)	$ (16,254)	$ (51,825)	$ (51,503)
Defined Benefit Plan, Service Cost	1,019	824	2,979	2,601
Defined Benefit Plan, Interest Cost	8,205	9,890	23,986	31,214
Defined Benefit Plan, Amortization of Gain (Loss)	761	0	2,224	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(51)		(148)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement		0		0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (7,794)	$ (5,540)	$ (22,784)	$ (17,688)