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Long-term Debt (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
maximumNumberOfLeverage
Dec. 31, 2019
USD ($)
Dec. 31, 2012
USD ($)
Dec. 20, 2012
Debt Instrument [Line Items]        
Long-term debt $ 598,848,000 $ 642,941,000    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Financing costs incurred 2,500,000      
Maximum borrowing capacity 900,000,000      
Increase in aggregate amount of revolving credit facility allowed 425,000,000      
Line of Credit Facility Financing Costs Carried Over $ 1,200,000      
Debt Instrument, Term 5 years      
Average interest rate during period 1.40% 3.00%    
Long-term debt $ 0 $ 44,678,000    
Outstanding letters of credit 2,000,000 3,000,000    
Unused portion of revolving credit facility 898,000,000 $ 803,000,000    
Payments of Financing Costs $ 1,300,000      
Basis spread on NYFRB rate 0.50%      
Basis spread on adjusted LIBO rate 1.00%      
MaximumLeverageRatio | maximumNumberOfLeverage 3.75      
Revolving Credit Facility [Member] | Letters of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 50,000,000      
Revolving Credit Facility [Member] | Multicurrency Borrowings [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity 500,000,000      
Revolving Credit Facility [Member] | Swingline Loans [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 20,000,000      
Revolving Credit Facility [Member] | Loans Bearing Interest Based On ABR [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Interest Rate Description 0.000      
Revolving Credit Facility [Member] | Loans Bearing Interest Based On ABR [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Interest Rate Description 0.375      
Revolving Credit Facility [Member] | Loans Bearing Interest Based On Adjusted LIBO Rate [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Interest Rate Description 0.875      
Revolving Credit Facility [Member] | Loans Bearing Interest Based On Adjusted LIBO Rate [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Interest Rate Description 1.375      
4.10% Senior Notes [Member]        
Debt Instrument [Line Items]        
Principal amount of debt issued $ 350,000,000      
Senior notes, interest rate 4.10% 4.10%    
Senior notes issue price       99.83%
Financing costs incurred     $ 5,000,000  
Long-term debt $ 348,848,000 $ 348,263,000    
3.78% Senior Notes [Member]        
Debt Instrument [Line Items]        
Principal amount of debt issued $ 250,000,000      
Senior notes, interest rate 3.78% 3.78%    
Annual principal payments beginning January 4, 2025 $ 50,000,000      
Long-term debt $ 250,000,000 $ 250,000,000