Pension and Other Postretirement Benefits (Components of Net Periodic Postretirement Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Ultimate healthcare trend rates	4.00%	4.00%	3.80%
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 194	$ 127	$ 125
Amortization of unrecognized prior service cost	60	60	44
Loss amortization (2)	0	24	113
Net periodic pension cost	$ 254	$ 211	$ 282
Discount rate	4.70%	4.80%	2.40%
Annual rate of increase in the per capita cost of: Medical costs before age 65	7.80%	7.80%	7.00%
Annual rate of increase in the per capita cost of: Medical costs after age 65	4.60%	4.50%	4.50%
Annual rate of increase in the per capita cost of: Prescription drug costs	7.80%	7.80%	7.00%