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Employee Benefit Plans (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2019
USD ($)
plan
Sep. 29, 2018
USD ($)
Sep. 28, 2019
USD ($)
plan
Sep. 29, 2018
USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Amount Company expects to contribute to its pension plans $ 4,200   $ 4,200  
Payment for pension benefits     $ 2,700 $ 2,800
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 5   5  
Number of Multiemployer Plans, Certified Yellow Zone | plan 2   2  
Number Of Multiemployer Plans, Withdrawal Obligation | plan 5   5  
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan $ 6,100   $ 6,100  
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 664 $ 762 $ 2,025 2,340
Interest cost 1,698 1,603 5,122 4,844
Expected return on plan assets (1,816) (2,053) (5,452) (6,176)
Amortization of prior service cost 9 9 27 26
Amortization of net loss 1,146 888 3,439 2,664
Net pension cost $ 1,701 $ 1,209 $ 5,161 $ 3,698