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Employee Benefit Plans (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2016
USD ($)
plan
Oct. 03, 2015
USD ($)
Oct. 01, 2016
USD ($)
plan
Oct. 03, 2015
USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Amount Company expects to contribute to its pension plans     $ 3,700  
Pension Contributions     $ 2,900 $ 5,000
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 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 $ 1,900   $ 1,900  
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 599 $ 1,633 $ 1,921 4,978
Interest cost 1,702 2,622 5,217 7,907
Expected return on plan assets (1,886) (3,053) (5,661) (9,169)
Amortization of prior service cost/(benefit) 8 (21) 22 (61)
Amortization of net loss 1,168 1,286 3,502 3,855
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments (62) 0 (1,285) 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements 0 0 (123) 0
Net pension cost $ 1,529 $ 2,467 $ 3,593 $ 7,510