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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Jul. 01, 2024
Change in plan assets:        
Beginning balance $ 209,339      
Ending balance 221,067 $ 209,339    
Funded status of the plan at year end       $ (2,800)
Fixed income investments percentage   65.00%    
Pension        
Change in benefit obligation:        
Beginning balance 174,112 $ 189,986    
Benefit obligation 0 0    
Service cost 0 0 $ 0  
Interest cost 8,775 8,648 8,782  
Actuarial loss (gain) 4,269 (13,588)    
Benefits paid (11,466) (10,934)    
Ending balance 175,690 174,112 189,986  
Change in plan assets:        
Beginning balance 209,339 217,167    
Actual return on plan assets 23,194 3,106    
Employer contributions 0 0    
Benefits paid (11,466) (10,934)    
Ending balance 221,067 209,339 217,167  
Funded status of the plan at year end 45,377 35,227    
SERP        
Change in benefit obligation:        
Beginning balance 3,598 4,139    
Benefit obligation 106 0    
Service cost 0 0 0  
Interest cost 172 178 191  
Actuarial loss (gain) 241 (260)    
Benefits paid (449) (459)    
Ending balance 3,668 3,598 4,139  
Change in plan assets:        
Beginning balance 0 0    
Actual return on plan assets 0 0    
Employer contributions 449 459    
Benefits paid (449) (459)    
Ending balance 0 0 0  
Funded status of the plan at year end (3,668) (3,598)    
OPEB        
Change in benefit obligation:        
Beginning balance 13,667 22,669    
Benefit obligation 0 0    
Service cost 19 17 27  
Interest cost 692 956 1,042  
Actuarial loss (gain) (88) 3,637    
Benefits paid (741) (13,612)    
Ending balance 13,549 13,667 22,669  
Change in plan assets:        
Beginning balance 0 0    
Actual return on plan assets 0 0    
Employer contributions 741 13,612    
Benefits paid (741) (13,612)    
Ending balance 0 0 $ 0  
Funded status of the plan at year end $ (13,549) $ (13,667)