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Components of Net Periodic Benefit Cost - Employer Contributions (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
Defined Benefit Plan Disclosure |  |  |
Amount of potential discretionary contributions accrued to a defined contribution plan | $ 1,600,000 |  | $ 1,300,000
Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Expected future benefit payment |  | $ 3,900,000 |
Contributions by employer | 526,000 |  |
Pension Benefits | Employee Stock Option |  |  |
Defined Benefit Plan Disclosure |  |  |
Expected future benefit payment |  | 604,000 |
Contributions by employer | 0 |  |
Postretirement Health Coverage |  |  |
Defined Benefit Plan Disclosure |  |  |
Expected future benefit payment |  | $ 249,000 |
Contributions by employer | $ 134,000 |  |

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