Components of Net Periodic Benefit Cost - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 108	$ 142	$ 323	$ 424
Interest cost	1,016	947	3,049	2,841
Expected return on plan assets	(1,094)	(1,051)	(3,281)	(3,154)
Net amortization of net (gain) loss		109		326
Net Periodic Benefit Cost	30	147	91	437
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4	9	12
Interest cost	32	34	96	103
Net amortization of net (gain) loss	(39)	(20)	(117)	(60)
Net Periodic Benefit Cost	$ (4)	$ 18	$ (12)	$ 55