Pension Benefits and Other Postretirement Benefits (Components of Net Periodic Benefit (Credit) Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	268	191
Expected return of plan assets	(356)	(340)
Amortization of prior service credit	0	0
Amortization of net loss (gain)	122	111
Net periodic benefit (credit) cost	34	(38)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	10
Interest cost	17	8
Expected return of plan assets	0	0
Amortization of prior service credit	0	0
Amortization of net loss (gain)	(2)	0
Net periodic benefit (credit) cost	$ 34	$ 18