Components of Net Periodic Benefit Cost - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 157	$ 298	$ 314	$ 595
Interest cost	956	707	1,912	1,413
Expected return on plan assets	(969)	(1,228)	(1,939)	(2,455)
Net amortization of net (gain) loss	188	314	376	629
Net periodic pension cost	332	91	663	182
Post-Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	9	10	17
Interest cost	39	27	77	55
Net amortization of net (gain) loss	(13)		(26)
Net periodic pension cost	$ 31	$ 36	$ 61	$ 72