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Retirement Benefit Plans - Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial (gain) loss	$ (3,985)	$ (10,639)	$ 17,148
Amounts reclassified from (AOCL)	(2,871)	(4,781)	(2,224)
Total (gain) loss recognized in OCI (OCL)	(6,856)	(15,420)	14,924
SERP
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial (gain) loss	(260)	183	(581)
Amounts reclassified from (AOCL)	(12)	(6)	(26)
Total (gain) loss recognized in OCI (OCL)	(272)	177	(607)
OPEB
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial (gain) loss	955	(382)	(4,992)
Amounts reclassified from (AOCL)	976	2,704	40
Total (gain) loss recognized in OCI (OCL)	$ 1,931	$ 2,322	$ (4,952)

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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