Pension Benefits and Other Postretirement Benefits (Components of Net Periodic Benefit (Credit) Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	191	184
Expected return of plan assets	(340)	(390)
Amortization of prior service credit	0	0
Amortization of net loss	111	98
Net periodic benefit (credit) cost	(38)	(108)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	15
Interest cost	8	6
Expected return of plan assets	0	0
Amortization of prior service credit	0	(24)
Amortization of net loss	0	0
Net periodic benefit (credit) cost	$ 18	$ (3)