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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 157 | $ 297 | $ 471 | $ 892
Interest cost | 956 | 707 | 2,868 | 2,120
Expected return on plan assets | (970) | (1,227) | (2,909) | (3,682)
Net amortization of net (gain) loss | 188 | 315 | 564 | 944
Net periodic pension cost | 331 | 92 | 994 | 274
Post-Retirement Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 5 | 8 | 15 | 25
Interest cost | 38 | 28 | 115 | 83
Net amortization of net (gain) loss | (13) |  | (40) |
Net periodic pension cost | $ 30 | $ 36 | $ 90 | $ 108

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