Retirement Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 137	$ 130
Interest cost	390	354
Expected loss on plan assets	(933)	(892)
Amortization of net actuarial loss	204	317
Net periodic benefit (income) cost	(202)	(91)
Other Post Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	30	36
Interest cost	24	21
Expected loss on plan assets	0	0
Amortization of net actuarial loss	14	12
Net periodic benefit (income) cost	$ 68	$ 69