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Employee Benefit Plans (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
USD ($)
plan
Sep. 30, 2017
USD ($)
Sep. 29, 2018
USD ($)
plan
Sep. 30, 2017
USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Amount Company expects to contribute to its pension plans $ 4,800   $ 4,800  
Payment for pension benefits     $ 2,800 $ 2,600
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 $ 1,700   $ 1,700  
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 762 $ 759 $ 2,340 2,244
Interest cost 1,603 1,672 4,844 5,020
Expected return on plan assets (2,053) (1,799) (6,176) (5,377)
Amortization of prior service cost 9 9 26 27
Amortization of net loss 888 1,204 2,664 3,610
Net pension cost $ 1,209 $ 1,845 $ 3,698 $ 5,524