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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Components of net periodic benefit cost (credit)        
Service cost $ 1,162 $ 1,327 $ 3,719 $ 3,958
Interest cost 2,655 2,645 8,470 8,033
Expected return on plan assets (1,936) (1,838) (6,078) (5,510)
Settlements 1,722 142 1,722 142
Amortization of net loss (gain) 76 60 217 177
Amortization of prior service cost (credit) 23 24 67 70
Net periodic benefit cost (credit) 3,702 2,360 8,117 6,870
Postretirement Benefits        
Components of net periodic benefit cost (credit)        
Service cost 80 84 241 250
Interest cost 137 129 412 389
Expected return on plan assets 0 0 0 0
Settlements 0 0 0 0
Amortization of net loss (gain) (258) (252) (775) (760)
Amortization of prior service cost (credit) (1) (35) (3) (103)
Net periodic benefit cost (credit) $ (42) $ (74) $ (125) $ (224)