Pension and Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018	Dec. 31, 2017
Defined Benefit Plan Plan Amendment [Abstract]
Defined benefit plan accumulated benefit obligation increase for plan amendment		$ 35,192
Date of resolution approval plan termination		February 2018
U.S. pension plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rate		3.20%	3.70%
Unrecognized losses, U.S. pension plan, remaining in accumulated other comprehensive loss	$ (141,578)
Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,037	$ 685
Interest cost	2,205	4,016
Expected return on assets	(2,038)	(5,205)
Net amortization and deferrals	1,698	2,977
Net periodic benefit cost	2,902	2,473
Contributions to defined benefit pension plans	230
Expected fiscal year defined benefit pension plan contributions	1,600
Postretirement [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	178	188
Interest cost	316	292
Expected return on assets	0	0
Net amortization and deferrals	5	42
Net periodic benefit cost	$ 499	$ 522