Retirement Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 142	$ 131	$ 279	$ 261
Interest cost	397	353	787	707
Expected loss on plan assets	(945)	(901)	(1,878)	(1,793)
Amortization of net actuarial loss	205	317	409	634
Net periodic benefit (income) cost	(201)	(100)	(403)	(191)
Other Post Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	32	35	62	71
Interest cost	24	22	48	43
Expected loss on plan assets	0	0	0	0
Amortization of net actuarial loss	13	12	27	24
Net periodic benefit (income) cost	$ 69	$ 69	$ 137	$ 138