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Components of Net Periodic Benefit Cost - Employer Contributions (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount of potential discretionary contributions accrued to a defined contribution plan | $ 1,900,000 |  | $ 1,700,000
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected future benefit payment |  | $ 0 |
Pension Benefits | Employee Stock Option [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected future benefit payment |  | 642,000 |
Contributions by employer | 0 |  |
Post-Retirement Health Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected future benefit payment |  | $ 245,000 |
Contributions by employer | $ 163,000 |  |

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