Pension and Other Postretirement Benefits (Components of Net Periodic Postretirement Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Ultimate healthcare trend rates	4.00%	3.80%	3.80%
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0	$ 10
Interest cost	127	125	172
Amortization of unrecognized prior service cost	60	44	44
Loss amortization (2)	24	113	64
Net periodic pension cost	$ 211	$ 282	$ 290
Discount rate	4.80%	2.40%	2.00%
Annual rate of increase in the per capita cost of: Medical costs before age 65	7.80%	7.00%	7.00%
Annual rate of increase in the per capita cost of: Medical costs after age 65	4.50%	4.50%	4.50%
Annual rate of increase in the per capita cost of: Prescription drug costs	7.80%	7.00%	7.00%