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Retirement Benefit Plans - Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial (gain) loss	$ (6,693)	$ (3,985)	$ (10,639)
Amortization of transition obligation	0	0	0
Amortization of actuarial (loss) gain	(2,061)	(2,871)	(4,781)
Total (gain) loss recognized in OCI (OCL)	(8,754)	(6,856)	(15,420)
SERP
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial (gain) loss	241	(260)	183
Amortization of transition obligation	2	0	0
Amortization of actuarial (loss) gain	11	(12)	(6)
Total (gain) loss recognized in OCI (OCL)	254	(272)	177
OPEB
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial (gain) loss	(251)	955	(382)
Amortization of transition obligation	0	0	0
Amortization of actuarial (loss) gain	528	976	2,704
Total (gain) loss recognized in OCI (OCL)	$ 277	$ 1,931	$ 2,322

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