Components of Net Periodic Benefit Cost - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 157	$ 297	$ 471	$ 892
Interest cost	956	707	2,868	2,120
Expected return on plan assets	(970)	(1,227)	(2,909)	(3,682)
Net amortization of net (gain) loss	188	315	564	944
Net periodic pension cost	331	92	994	274
Post-Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	8	15	25
Interest cost	38	28	115	83
Net amortization of net (gain) loss	(13)		(40)
Net periodic pension cost	$ 30	$ 36	$ 90	$ 108