Net Periodic Benefit Cost - Defined Benefit Pension Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Defined Benefit Plan Disclosure [Line Items]
Curtailment cost			$ 49
Pension plans, defined benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service costs--increase in benefit obligation earned	$ 4	$ 12	30	$ 38
Interest cost on projected benefit obligation	376	405	1,131	1,214
Expected return on plan assets	(405)	(499)	(1,216)	(1,495)
Curtailment cost	0	0	49	0
Amortization of net actuarial loss	345	177	1,078	531
Amortization of prior service cost	1	4	5	10
Net pension cost of defined benefit pension plans	$ 321	$ 99	$ 1,077	$ 298