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Pension and Other Postretirement Benefits - Plan Assets and Type of Fair Value Measurement (Details) - Pension Benefits - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Pension and Other Postretirement Benefits    
Fair value of plan assets $ 155,185 $ 163,136
Fixed income securities    
Pension and Other Postretirement Benefits    
Fair value of plan assets 24,371 23,482
Level 1    
Pension and Other Postretirement Benefits    
Fair value of plan assets 132 359
Level 2    
Pension and Other Postretirement Benefits    
Fair value of plan assets 24,239 23,123
Level 3    
Pension and Other Postretirement Benefits    
Fair value of plan assets 0 0
Cash | Fixed income securities    
Pension and Other Postretirement Benefits    
Fair value of plan assets 132 359
Cash | Level 1    
Pension and Other Postretirement Benefits    
Fair value of plan assets 132 359
Cash | Level 2    
Pension and Other Postretirement Benefits    
Fair value of plan assets 0 0
Cash | Level 3    
Pension and Other Postretirement Benefits    
Fair value of plan assets 0 0
Fixed income securities | Fixed income securities    
Pension and Other Postretirement Benefits    
Fair value of plan assets 24,239 23,123
Fixed income securities | Level 1    
Pension and Other Postretirement Benefits    
Fair value of plan assets 0 0
Fixed income securities | Level 2    
Pension and Other Postretirement Benefits    
Fair value of plan assets 24,239 23,123
Fixed income securities | Level 3    
Pension and Other Postretirement Benefits    
Fair value of plan assets 0 0
Commingled funds | Measured at net asset value    
Pension and Other Postretirement Benefits    
Fair value of plan assets $ 130,814 $ 139,654