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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Related Party Transaction [Line Items] |  |  |  |  |
Accounts Payable, Current | $ 78,067 |  | $ 78,067 |  | $ 84,180
Revenue from Contract with Customer, Excluding Assessed Tax | 519,143 | $ 529,427 | 1,566,942 | $ 1,640,150 |
Affiliated Entity [Member] | Avion and Airmax [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  |  | 500 | 300 |
Accounts Payable, Current | $ 73 |  | $ 73 |  |
Affiliated Entity [Member] | Willis Towers Watson [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  |  |  | $ 2,300 |
Chief Executive Officer [Member] | Avion and Airmax [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 100.00% |  | 100.00% |  |

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