Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
U.S. Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 16	$ 19
Interest cost	130	128
Expected return on assets	(156)	(144)
Recognized actuarial net loss	73	62
Total defined benefit net periodic pension cost	63	65
Multiemployer benefit expense	252	278
Net periodic pension cost	315	343
UK Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	531	581
Expected return on assets	(414)	(412)
Recognized actuarial net loss	11	23
Total defined benefit net periodic pension cost	128	192
Multiemployer benefit expense	0	0
Net periodic pension cost	$ 128	$ 192