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Long-Term Debt And Lines of Credit (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 28, 2023
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Jun. 28, 2022
Debt Instrument [Line Items]          
Standby letters of credit     $ 45,200    
SOFR [Member]          
Debt Instrument [Line Items]          
Basis spread on variable interest rate     100.00% 100.00%  
2018 Credit Agreement [Member]          
Debt Instrument [Line Items]          
Standby letters of credit     $ 45,200    
2018 Credit Agreement [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Unused lines of credit     404,800    
2022 Credit Facilities [Member]          
Debt Instrument [Line Items]          
Borrowing capacity     $ 450,000 $ 550,000  
2022 Credit Facilities [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facility period, years     5 years    
Borrowing capacity         $ 450,000
2022 Credit Facilities [Member] | Expansion Feature [Member]          
Debt Instrument [Line Items]          
Borrowing capacity         250,000
2022 Credit Facilities [Member] | Term Loan [Member]          
Debt Instrument [Line Items]          
Borrowing capacity         100,000
Periodic principal payments   $ 1,250 $ 1,250    
Frequency of principal payments     last day of each fiscal quarter    
Repayment of long-term debt (Note 3) $ 21,300 $ 75,000      
Prepayment penalties     $ 0    
Amount outstanding         $ 100,000
Deferred financing costs     $ 0