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Retirement Benefit Plans - Changes in Plan Assets and Funded Status of Pension Plans and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jul. 01, 2024
Change in plan assets:        
Beginning balance $ 217,167      
Ending balance $ 209,339 $ 217,167    
Funded status of the plan at year end       $ 3,300
Fixed income investments percentage 65.00%      
Pension        
Change in benefit obligation:        
Beginning balance $ 189,986 187,836    
Service cost 0 0 $ 0  
Interest cost 8,648 8,782 5,565  
Actuarial (gain) loss (13,588) 3,333    
Benefits paid (10,934) (9,965)    
Ending balance 174,112 189,986 187,836  
Change in plan assets:        
Beginning balance 217,167 201,382    
Actual return on plan assets 3,106 25,750    
Employer contributions 0 0    
Benefits paid (10,934) (9,965)    
Ending balance 209,339 217,167 201,382  
Funded status of the plan at year end 35,227 27,181    
SERP        
Change in benefit obligation:        
Beginning balance 4,139 4,245    
Service cost 0 0 0  
Interest cost 178 191 107  
Actuarial (gain) loss (260) 183    
Benefits paid (459) (480)    
Ending balance 3,598 4,139 4,245  
Change in plan assets:        
Beginning balance 0 0    
Actual return on plan assets 0 0    
Employer contributions 459 480    
Benefits paid (459) (480)    
Ending balance 0 0 0  
Funded status of the plan at year end (3,598) (4,139)    
OPEB        
Change in benefit obligation:        
Beginning balance 22,669 22,822    
Service cost 17 27 34  
Interest cost 956 1,042 652  
Actuarial (gain) loss 3,637 (382)    
Benefits paid (13,612) (840)    
Ending balance 13,667 22,669 22,822  
Change in plan assets:        
Beginning balance 0 0    
Actual return on plan assets 0 0    
Employer contributions 13,612 840    
Benefits paid (13,612) (840)    
Ending balance 0 0 $ 0  
Funded status of the plan at year end $ (13,667) $ (22,669)