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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	191	184	382	368
Expected return of plan assets	(340)	(390)	(680)	(780)
Amortization of prior service credit	0	0	0	0
Amortization of net loss	111	98	222	196
Net periodic benefit (credit) cost	(38)	(108)	(76)	(216)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	15	20	30
Interest cost	8	6	16	12
Expected return of plan assets	0	0	0	0
Amortization of prior service credit	0	(24)	0	(48)
Amortization of net loss	0	0	0	0
Net periodic benefit (credit) cost	$ 18	$ (3)	$ 36	$ (6)