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Retirement Benefit Plans - Summary of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0 $ 0 $ 0
Interest cost 8,775 8,648 8,782
Expected return on plan assets (12,231) (12,709) (11,778)
Amortization of transition obligation 0 0 0
Amortization of actuarial loss (gain) 2,061 2,871 4,781
Other 0 0 0
Net periodic benefit cost (benefit) (1,395) (1,190) 1,785
SERP      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 172 178 191
Expected return on plan assets 0 0 0
Amortization of transition obligation (2) 0 0
Amortization of actuarial loss (gain) (11) 12 6
Other 0 0 0
Net periodic benefit cost (benefit) 159 190 197
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 19 17 27
Interest cost 692 956 1,042
Expected return on plan assets 0 0 0
Amortization of transition obligation 0 0 0
Amortization of actuarial loss (gain) (528) (976) (2,704)
Other 0 3,212 0
Net periodic benefit cost (benefit) $ 183 $ 3,209 $ (1,635)