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Long-Term Debt (Senior Credit Facility) (Details)
12 Months Ended
Mar. 26, 2015
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 25, 2015
USD ($)
2013 Senior Secured Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity under credit facility       $ 1,000,000,000
2015 Senior Secured Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity under credit facility $ 1,800,000,000      
Commitment fee percentage   0.125%    
Unamortized financing costs $ 6,873,000      
Utilized borrowings under credit facility   $ 1,452,330,000    
Available amount under credit facility   347,670,000    
2015 Senior Secured Credit Facility | Minimum        
Line of Credit Facility [Line Items]        
Commitment fee percentage 0.10%      
Consolidated interest coverage ratio 3.0      
2015 Senior Secured Credit Facility | Maximum        
Line of Credit Facility [Line Items]        
Commitment fee percentage 0.225%      
Consolidated net leverage ratio 3.75      
2015 Senior Secured Credit Facility | Borrowings        
Line of Credit Facility [Line Items]        
Utilized borrowings under credit facility   57,896,000    
2015 Senior Secured Credit Facility | Standby letters of credit related to various insurance contracts and foreign vendor commitments        
Line of Credit Facility [Line Items]        
Utilized borrowings under credit facility   $ 54,591,000    
2015 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR)        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument   1.125%    
2015 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 1.00%      
2015 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 1.75%      
2015 Senior Secured Credit Facility | Federal Funds Effective Swap Rate        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 0.50%      
2015 Senior Secured Credit Facility | Monthly LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 1.00% 0.125%    
2015 Senior Secured Credit Facility | Monthly LIBOR | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 0.00%      
2015 Senior Secured Credit Facility | Monthly LIBOR | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 0.75%      
2015 Senior Secured Credit Facility Amendment        
Line of Credit Facility [Line Items]        
Unamortized financing costs     $ 567,000  
Commercial Paper        
Line of Credit Facility [Line Items]        
Utilized borrowings under credit facility   $ 1,339,843,000