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Benefit Plans - Reconciliation of Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in plan assets      
Fair value of assets at beginning of year $ 306,711    
Fair value of plan assets at end of year 331,172 $ 306,711  
Pension Benefits      
Change in benefit obligation      
Benefit obligation at beginning of year 297,834 289,123  
Service cost 6,662 7,569 $ 9,359
Interest cost 14,451 14,234 10,708
Actuarial loss (gain) (14,816) 5,794  
Implicit rate subsidy 0 0  
Plan participants contributions 0 0  
Administrative expenses paid (146) (137)  
Benefits paid and settlements (16,941) (18,749)  
Benefit obligation at end of year 287,044 297,834 289,123
Change in plan assets      
Fair value of assets at beginning of year 285,504 251,960  
Actual return on plan assets 31,523 41,285  
Employer contributions 8,007 11,145  
Plan participants contributions 0 0  
Administrative expenses paid (146) (137)  
Benefits paid and settlements (16,941) (18,749)  
Fair value of plan assets at end of year 307,947 285,504 251,960
Funded status at end of year 20,903 (12,330)  
Other Postretirement Benefits      
Change in benefit obligation      
Benefit obligation at beginning of year 24,264 25,830  
Service cost 665 638 1,032
Interest cost 1,181 1,268 883
Actuarial loss (gain) (146) (2,645)  
Implicit rate subsidy (336) (237)  
Plan participants contributions 183 179  
Administrative expenses paid 0 0  
Benefits paid and settlements (731) (769)  
Benefit obligation at end of year 25,080 24,264 25,830
Change in plan assets      
Fair value of assets at beginning of year 21,207 17,952  
Actual return on plan assets 2,879 3,136  
Employer contributions 7 920  
Plan participants contributions 183 179  
Administrative expenses paid (71) (67)  
Benefits paid and settlements (980) (913)  
Fair value of plan assets at end of year 23,225 21,207 $ 17,952
Funded status at end of year $ (1,855) $ (3,057)