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Pension Plans (Details) - Multi-employer defined benefit pension plan - Consenting agreement entered with local bargaining union - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plans |  |  |  |  |
Insolvent period | 20 years |  |  |  |
Estimated liability upon withdrawal from plan |  |  | $ 96,000 | $ 104,300 | $ 99,300
Percentage of annual compounded surcharge for rehabilitation | 5.00% |  |  |  |
Pension expense | $ 2,785 | $ 2,754 | 3,510 | 3,156 |
Surcharges | $ 982 | $ 971 | $ 1,237 | $ 1,112 |

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- Definition The portion of the entity's pension expense for the multiemployer plan that represents an increase in the surcharge, during the period. + References No definition available. + Details
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- Definition Estimated amount of the obligation that would be recognized due to withdrawing from a 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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- Definition Represents the number of years until the Plan is expected to become insolvent based on the "critical and declining status" designation. + References No definition available. + Details
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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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