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Long-Term Debt (Senior Credit Facility) (Details)
12 Months Ended
Oct. 18, 2019
USD ($)
Sep. 11, 2014
USD ($)
Dec. 31, 2019
USD ($)
Dec. 19, 2012
USD ($)
Line of Credit Facility [Line Items]        
Maximum borrowing capacity under credit facility   $ 500,000   $ 300,000
Basis spread on debt instrument   0.70%    
Commitment fee percentage   0.30%    
Senior Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity under credit facility $ 1,800,000,000      
Commitment fee percentage     0.11%  
Maximum permitted consolidated net leverage ratio 4.00      
Unamortized financing costs $ 3,405,000      
Utilized borrowings under credit facility     $ 733,536,000  
Available amount under credit facility     1,066,464,000  
Senior Credit Facility | Minimum        
Line of Credit Facility [Line Items]        
Commitment fee percentage 0.09%      
Consolidated interest coverage ratio 3.0      
Senior Credit Facility | Maximum        
Line of Credit Facility [Line Items]        
Commitment fee percentage 0.20%      
Consolidated net leverage ratio 3.75      
Senior Credit Facility | Borrowings        
Line of Credit Facility [Line Items]        
Utilized borrowings under credit facility     16,803,000  
Senior 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     $ 22,787,000  
Senior Credit Facility | London Interbank Offered Rate (LIBOR)        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument     1.125%  
Senior Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 1.00%      
Senior Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 1.75%      
Senior Credit Facility | Federal Funds Effective Swap Rate        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 0.50%      
Senior Credit Facility | Monthly LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 1.00%   0.125%  
Senior Credit Facility | Monthly LIBOR | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 0.00%      
Senior Credit Facility | Monthly LIBOR | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on debt instrument 0.75%      
2019 Senior Secured Credit Facility Amendment        
Line of Credit Facility [Line Items]        
Unamortized financing costs     $ 2,264,000  
Commercial Paper        
Line of Credit Facility [Line Items]        
Utilized borrowings under credit facility     $ 693,946,000