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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets of deferred compensation plan | $ 165,466 | $ 143,499 |
Available-for-sale debt securities | 40,799 | 39,459 | $ 43,485
Deferred compensation plan obligations | (165,466) | (143,499) |
Bank debt | (337,300) | (312,400) |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets of deferred compensation plan | 165,466 | 143,499 |
Available-for-sale debt securities | 40,799 | 39,459 |
Other depository assets | 346 | 1,031 |
Deferred compensation plan obligations | (165,466) | (143,499) |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate swaps | 1,279 | 3,999 |
Bank debt | (335,835) | (310,826) |
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent purchase price liabilities | $ (78,002) | $ (114,946) |

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