Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 03, 2015	Mar. 28, 2014
U.S. Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 20	$ 14
Interest cost	145	140
Expected return on assets	(189)	(186)
Recognized actuarial net loss	78	2
Total defined benefit net periodic pension cost	54	(30)
Multiemployer benefit expense	272	258
Net periodic pension cost	326	228
UK Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	440	552
Expected return on assets	(392)	(466)
Recognized actuarial net loss	44	18
Total defined benefit net periodic pension cost	92	104
Multiemployer benefit expense	0	0
Net periodic pension cost	$ 92	$ 104