RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transaction Line Items
Accounts payable, current, total	$ 90,473		$ 96,577
Sales Revenue Services Net	576,638	$ 633,286
Affiliated Entity | Avion and Airmax [Member]
Related Party Transaction Line Items
Purchases from Related Party	100	300
Accounts payable, current, total	36
Affiliated Entity | Willis Towers Watson [Member]
Related Party Transaction Line Items
Purchases from Related Party	$ 800	$ 800
Chief Executive Officer | Avion and Airmax [Member]
Related Party Transaction Line Items
Equity Method Investment, Ownership Percentage	100.00%