Long-Term Debt And Lines Of Credit (Narrative) (Details) - 2022 Credit Facilities [Member] - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2023	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	$ 45,500,000
Unused lines of credit	$ 404,500,000
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
Prepayment penalties		$ 0