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Components of Net Periodic Benefit Cost - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pension plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 108 | $ 142 | $ 323 | $ 424
Interest cost | 1,016 | 947 | 3,049 | 2,841
Expected return on plan assets | (1,094) | (1,051) | (3,281) | (3,154)
Net amortization of net (gain) loss |  | 109 |  | 326
Net Periodic Benefit Cost | 30 | 147 | 91 | 437
Postretirement Health Coverage |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 3 | 4 | 9 | 12
Interest cost | 32 | 34 | 96 | 103
Net amortization of net (gain) loss | (39) | (20) | (117) | (60)
Net Periodic Benefit Cost | $ (4) | $ 18 | $ (12) | $ 55

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