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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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