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Retirement Benefit Plans - Summary of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0 $ 0 $ 0
Interest cost 8,648 8,782 5,565
Expected return on plan assets (12,709) (11,778) (14,675)
Amortization of actuarial loss (gain) 2,871 4,781 2,224
Other 0 0 0
Net periodic benefit cost (benefit) (1,190) 1,785 (6,886)
SERP      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 178 191 107
Expected return on plan assets 0 0 0
Amortization of actuarial loss (gain) 12 6 26
Other 0 0 0
Net periodic benefit cost (benefit) 190 197 133
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 17 27 34
Interest cost 956 1,042 652
Expected return on plan assets 0 0 0
Amortization of actuarial loss (gain) (976) (2,704) (40)
Other 3,212 0 0
Net periodic benefit cost (benefit) $ 3,209 $ (1,635) $ 646