Retirement Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 133	$ 140	$ 399	$ 419
Interest cost	590	393	1,774	1,180
Expected loss on plan assets	(762)	(940)	(2,293)	(2,818)
Amortization of net actuarial loss (gain)	250	205	750	614
Net periodic benefit cost (income)	211	(202)	630	(605)
Other Post Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	30	57	92
Interest cost	32	25	96	73
Expected loss on plan assets	0	0	0	0
Amortization of net actuarial loss (gain)	(3)	14	(11)	41
Net periodic benefit cost (income)	$ 48	$ 69	$ 142	$ 206