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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction Line Items
Accounts payable, current, total	$ 96,577	$ 93,937
Sales Revenue Services Net	2,462,817	2,443,707	$ 2,273,062
Affiliated Entity \| Avion and Airmax [Member]
Related Party Transaction Line Items
Purchases from Related Party	1,000	500	600
Accounts payable, current, total	218
Affiliated Entity \| Welltok
Related Party Transaction Line Items
Sales Revenue Services Net		500	$ 1,500
Affiliated Entity \| Willis Towers Watson [Member]
Related Party Transaction Line Items
Purchases from Related Party	$ 3,800	$ 2,900
Chief Executive Officer \| Avion and Airmax [Member] \| Avion and Airmax [Member]
Related Party Transaction Line Items
Equity Method Investment, Ownership Percentage	100.00%