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Pension Plans (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2024 | Jun. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plans |  |  |  |  |  |  |
Granted special financial assistance funds |  | $ 3,400,000 |  |  |  |  |
Received special financial assistance funds | $ 3,400,000 |  |  |  |  |  |
Multi-employer defined benefit pension plan | Consenting agreement entered with local bargaining union |  |  |  |  |  |  |
Pension Plans |  |  |  |  |  |  |
Estimated liability upon withdrawal from plan |  |  |  |  | $ 102,200 | $ 96,000 | $ 104,300
Pension expense |  |  | $ 2,579 | $ 2,785 | 3,516 | 3,510 |
Surcharges |  |  | $ 909 | $ 982 | $ 1,239 | $ 1,237 |
Percentage of annual compounded surcharge for rehabilitation during year 2012 to 2020 |  |  | 5.00% |  |  |  |

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- Definition Represents employer payable compounded annual surcharge for rehabilitation within a specified period to the pension or postretirement benefit plan to which two or more unrelated employers contribute, where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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