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Employee Benefit Plans (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2015
USD ($)
plan
Jun. 28, 2014
USD ($)
Jul. 04, 2015
USD ($)
plan
Jun. 28, 2014
USD ($)
Jan. 01, 2011
USD ($)
Jan. 03, 2009
USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]            
Amount Company expects to contribute to its pension plans     $ 7,500      
Pension Contributions     $ 2,500 $ 8,000    
Multiemployer Plans [Abstract]            
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material | plan 2   2      
Number Of Multiemployer Plans Withdrawal Obligation Could Be Material Certified Red Zone | plan 1   1      
Number of Multiemployer Plans, Certified Red Zone | plan 4   4      
Number of Multiemployer Plans, Certified Yellow Zone | plan 2   2      
Number of Multiemployer Plans, Certified Orange Zone | plan 1   1      
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan $ 800   $ 800   $ 1,200 $ 3,200
Maximum [Member]            
Multiemployer Plans [Abstract]            
Multiemployer Plan, Contributions To Individual Plan, Percent     5.00%      
Pension Plan, Defined Benefit [Member]            
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]            
Service cost 1,667 $ 1,496 $ 3,345 2,986    
Interest cost 2,638 3,353 5,285 6,700    
Expected return on plan assets (3,051) (3,612) (6,116) (7,220)    
Amortization of prior service cost (20) 4 (40) 8    
Amortization of net loss 1,284 520 2,569 1,040    
Net pension cost $ 2,518 $ 1,761 $ 5,043 $ 3,514