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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

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