Pension Benefits and Other Postretirement Benefits (Components of Net Periodic Benefit (Credit) Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	263	191	799	573
Expected return of plan assets	(354)	(340)	(1,066)	(1,020)
Amortization of prior service credit	0	0	0	0
Amortization of net loss (gain)	116	111	360	333
Net periodic benefit (credit) cost	25	(38)	93	(114)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	10	57	30
Interest cost	17	8	51	24
Expected return of plan assets	0	0	0	0
Amortization of prior service credit	0	0	0	0
Amortization of net loss (gain)	(3)	0	(7)	0
Net periodic benefit (credit) cost	$ 33	$ 18	$ 101	$ 54