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Employee Benefit Plans (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
USD ($)
plan
Jul. 02, 2016
USD ($)
Jul. 01, 2017
USD ($)
plan
Jul. 02, 2016
USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Amount Company expects to contribute to its pension plans $ 4,500   $ 4,500  
Payment for pension benefits     $ 1,600 $ 2,100
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 6   6  
Number of Multiemployer Plans, Certified Yellow Zone | plan 1   1  
Number Of Multiemployer Plans, Withdrawal Obligation | plan 2   2  
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan $ 1,800   $ 1,800  
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 (Credit) [Abstract]        
Service cost 750 $ 685 $ 1,485 1,322
Interest cost 1,679 1,770 3,348 3,515
Expected return on plan assets (1,790) (1,890) (3,578) (3,775)
Amortization of prior service cost/(benefit) 9 7 18 14
Amortization of net loss 1,203 1,166 2,406 2,334
Curtailment gain 0 0 0 (1,223)
Settlement gain 0 (123) 0 (123)
Net pension cost $ 1,851 $ 1,615 $ 3,679 $ 2,064