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Employee Benefit Plans (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2019
USD ($)
plan
Jun. 30, 2018
USD ($)
Jun. 29, 2019
USD ($)
plan
Jun. 30, 2018
USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Amount Company expects to contribute to its pension plans $ 4,300   $ 4,300  
Payment for pension benefits     $ 1,500 $ 1,500
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 2   2  
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan $ 1,600   $ 1,600  
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 683 $ 779 $ 1,361 1,578
Interest cost 1,714 1,616 3,424 3,241
Expected return on plan assets (1,817) (2,059) (3,636) (4,123)
Amortization of prior service cost 9 8 18 17
Amortization of net loss 1,147 888 2,293 1,776
Net pension cost $ 1,736 $ 1,232 $ 3,460 $ 2,489