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Pension and Other Postretirement Benefits - Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension Benefits      
Components of net periodic benefit cost (credit)      
Service cost $ 4,983 $ 5,321 $ 5,679
Interest cost 11,286 10,714 11,316
Expected return on plan assets (8,105) (7,349) (7,858)
Curtailment income 0 (48) 0
Settlements 2,270 104 (39)
Amortization of net loss (gain) 289 234 94
Amortization of prior service cost (credit) 89 95 182
Net periodic benefit cost (credit) 10,812 9,071 9,374
Postretirement Benefits      
Components of net periodic benefit cost (credit)      
Service cost 322 333 429
Interest cost 549 519 662
Expected return on plan assets 0 0 0
Curtailment income 0 0 0
Settlements 0 0 0
Amortization of net loss (gain) (1,032) (1,134) (893)
Amortization of prior service cost (credit) (4) (137) (137)
Net periodic benefit cost (credit) $ (165) $ (419) $ 61