Pension and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost (income)	$ 166	$ 289	$ 520	$ 921
Interest cost (income)	1,272	1,078	3,949	3,262
Expected return on plan assets	(1,942)	(2,075)	(6,038)	(6,250)
Actuarial loss (gain) amortization	238	737	743	2,449
Prior service cost (income) amortization	3	3	8	8
Net periodic benefit (income) cost	(263)	32	(818)	390
Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost (income)	1	(2)	1	1
Interest cost (income)	8	(1)	19	20
Expected return on plan assets	0	0	0	0
Actuarial loss (gain) amortization	(23)	(85)	(70)	(85)
Prior service cost (income) amortization	(8)	0	(17)	0
Net periodic benefit (income) cost	$ (22)	$ (88)	$ (67)	$ (64)