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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Related Party Transaction Line Items |  |  |  |  |
Accounts payable, current, total | $ 84,335 |  | $ 84,335 |  | $ 93,937
Sales Revenue Services Net | 600,394 | $ 604,250 | 1,233,680 | $ 1,192,976 |
Affiliated Entity | Avion and Airmax [Member] |  |  |  |  |
Related Party Transaction Line Items |  |  |  |  |
Purchases from Related Party |  | 300 | 700 |  |
Accounts payable, current, total | $ 276 |  | 276 |  |
Affiliated Entity | Willis Towers Watson [Member] |  |  |  |  |
Related Party Transaction Line Items |  |  |  |  |
Purchases from Related Party |  | $ 1,500 | $ 1,800 |  |
Chief Executive Officer | Avion and Airmax [Member] |  |  |  |  |
Related Party Transaction Line Items |  |  |  |  |
Equity Method Investment, Ownership Percentage | 100.00% |  | 100.00% |  |

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