Pension Benefits and Other Postretirement Benefits (Components of Net Periodic Benefit (Credit) Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	268	191	536	382
Expected return of plan assets	(356)	(340)	(712)	(680)
Amortization of prior service credit	0	0	0	0
Amortization of net loss (gain)	122	111	244	222
Net periodic benefit (credit) cost	34	(38)	68	(76)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	10	38	20
Interest cost	17	8	34	16
Expected return of plan assets	0	0	0	0
Amortization of prior service credit	0	0	0	0
Amortization of net loss (gain)	(2)	0	(4)	0
Net periodic benefit (credit) cost	$ 34	$ 18	$ 68	$ 36