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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension Benefits        
Components of net periodic benefit cost (credit)        
Service cost $ 1,327 $ 1,411 $ 3,958 $ 4,261
Interest cost 2,645 2,832 8,033 8,491
Expected return on plan assets (1,838) (1,966) (5,510) (5,894)
Settlements 142 0 142 (27)
Amortization of net loss (gain) 60 25 177 70
Amortization of prior service cost (credit) 24 45 70 137
Net periodic benefit cost (credit) 2,360 2,347 6,870 7,038
Postretirement Benefits        
Components of net periodic benefit cost (credit)        
Service cost 84 107 250 322
Interest cost 129 166 389 497
Expected return on plan assets 0 0 0 0
Settlements 0 0 0 0
Amortization of net loss (gain) (252) (223) (760) (670)
Amortization of prior service cost (credit) (35) (35) (103) (103)
Net periodic benefit cost (credit) $ (74) $ 15 $ (224) $ 46