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Components of Net Periodic Benefit Cost - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 107 $ 141 $ 215 $ 282
Interest cost 1,017 947 2,033 1,894
Expected return on plan assets (1,093) (1,052) (2,187) (2,103)
Net amortization of net (gain) loss   108   217
Net Periodic Benefit Cost 31 144 61 290
Postretirement Health Coverage        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 4 6 8
Interest cost 32 35 64 69
Net amortization of net (gain) loss (39) (20) (78) (40)
Net Periodic Benefit Cost $ (4) $ 19 $ (8) $ 37