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Employee Benefit Plans (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 29, 2013
plan
Jun. 30, 2012
Jun. 29, 2013
plan
Jun. 30, 2012
Jan. 01, 2011
Jan. 03, 2009
Defined Benefit Plan Disclosure [Line Items]            
Service cost $ 76,000 $ 82,000 $ 153,000 $ 163,000    
Interest cost 1,318,000 1,363,000 2,636,000 2,726,000    
Expected return on plan assets (1,819,000) (1,678,000) (3,638,000) (3,355,000)    
Amortization of prior service cost 15,000 22,000 30,000 44,000    
Amortization of net loss 1,300,000 1,189,000 2,600,000 2,378,000    
Net pension cost 890,000 978,000 1,781,000 1,956,000    
Amount Company expects to contribute to its pension plans     500,000      
Pension Contributions     200,000 900,000    
Multiemployer Plans [Abstract]            
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material 2   2      
Number Of Multiemployer Plans Withdrawal Obligation Could Be Material Certified Red Zone 1   1      
Number of Multiemployer Plans, Certified Red Zone 4   4      
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan $ 900,000   $ 900,000   $ 1,200,000 $ 3,200,000
Number of Multiemployer Plans, Certified Yellow Zone 2   2      
Maximum [Member]
            
Multiemployer Plans [Abstract]            
Multiemployer Plan, Contributions To Individual Plan, Percent     5.00%