Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefit)	$ 1,551	$ 1,927	$ 3,151	$ 3,906
Interest cost	6,273	6,010	12,548	11,930
Expected return on plan assets	(11,266)	(11,906)	(22,534)	(23,823)
Amortization of net (gain) or loss and prior service costs	1,118	1,420	2,258	2,624
Net periodic benefit cost	(2,324)	(2,549)	(4,577)	(5,363)
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefit)	9	9	18	18
Interest cost	154	154	308	308
Amortization of net (gain) or loss and prior service costs	(185)	(185)	(370)	(370)
Net periodic benefit cost	$ (22)	$ (22)	$ (44)	$ (44)