Employee Benefit Plans (Details) (USD $)	3 Months Ended
	Mar. 30, 2013 plan	Mar. 31, 2012	Jan. 01, 2011	Jan. 03, 2009
Defined Benefit Plan Disclosure [Line Items]
Number Of Multiemployer Plans, Certified Orange Zone	1
Service cost	$ 77,000	$ 81,000
Interest cost	1,318,000	1,363,000
Expected return on plan assets	(1,819,000)	(1,677,000)
Amortization of prior service cost	15,000	22,000
Amortization of net loss	1,300,000	1,189,000
Net pension cost	891,000	978,000
Amount Company expects to contribute to its pension plans	500,000
Pension Contributions	100,000	400,000
Multiemployer Plans [Abstract]
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material	2
Number Of Multiemployer Plans Withdrawal Obligation Could Be Material Certified Red Zone	1
Number of Multiemployer Plans, Certified Red Zone	4
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan	$ 900,000		$ 1,200,000	$ 3,200,000
Number of Multiemployer Plans, Certified Yellow Zone	1
Maximum [Member]
Multiemployer Plans [Abstract]
Multiemployer Plan, Contributions To Individual Plan, Percent	5.00%