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Long-Term Debt And Lines of Credit (Narrative) (Details) - 2022 Credit Facilities [Member] - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 28, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Dec. 31, 2022 | Jun. 28, 2022
Debt Instrument [Line Items] |  |  |  |  |
Borrowing capacity |  | $ 450,000,000.0 |  | $ 550,000,000.0 |
Basis spread on variable interest rate |  |  | 1.00% |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  | us-gaap:SecuredOvernightFinancingRateSofrMember |  |
Standby letters of credit |  |  | $ 45,200,000 |  |
Unused lines of credit |  |  | $ 404,800,000 |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility period, years |  |  | 5 years |  |
Borrowing capacity |  |  |  |  | $ 450,000,000.0
Expansion Feature [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowing capacity |  |  |  |  | 250,000,000.0
Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility period, years |  |  | 5 years |  |
Debt instrument, face amount |  |  |  |  | $ 100,000,000.0
Periodic principal payments |  | 1,250,000 |  |  |
Repayment of long-term debt | $ 21,300,000 | $ 75,000,000.0 |  |  |
Prepayment penalties |  |  | $ 0 |  |
Deferred financing costs |  |  | $ 0 |  |

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