Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Other Post-Retirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 175	$ 130	$ 117
Interest cost	170	156	147
Expected return on plan assets	(2)	(2)	(2)
Amortization of net actuarial loss	83	50	30
Amortization of prior service cost	88	88	88
Settlement loss	0	114	0
Net Periodic Benefit Cost	514	536	380
U.S. Pension | Pension benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	685	723	842
Interest cost	1,231	1,273	1,229
Expected return on plan assets	(1,326)	(1,288)	(1,421)
Amortization of net actuarial loss	442	498	508
Amortization of prior service cost	53	55	55
Settlement loss	0	0	0
Net Periodic Benefit Cost	1,085	1,261	1,213
Non-U.S. Pension | Pension benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	148	102	105
Interest cost	114	107	102
Expected return on plan assets	(25)	(25)	(40)
Amortization of net actuarial loss	38	39	38
Amortization of prior service cost	6	4	4
Settlement loss	0	0	0
Net Periodic Benefit Cost	$ 281	$ 227	$ 209