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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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