RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Related Party Transaction Line Items
Sales Revenue Services Net	$ 592,453	$ 566,734	$ 1,785,429	$ 1,660,747
Airmax [Member]
Related Party Transaction Line Items
Purchases from Related Party			400	500
Accounts Payable Due from Related Party	$ 72		72
Welltok
Related Party Transaction Line Items
Sales Revenue Services Net			500	1,200
Unisys [Member]
Related Party Transaction Line Items
Sales Revenue Services Net			100	$ 400
Willis Towers Watson [Member]
Related Party Transaction Line Items
Purchases from Related Party			$ 900