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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction Line Items
Sales Revenue Services Net	$ 566,734,000	$ 492,980,000	$ 1,660,747,000	$ 1,378,274,000
Airmax [Member]
Related Party Transaction Line Items
Purchases from Related Party			500,000	300,000
Accounts Payable Due from Related Party	$ 50,000		50,000
Welltok
Related Party Transaction Line Items
Sales Revenue Services Net			1,200,000	$ 2,400,000
Unisys [Member]
Related Party Transaction Line Items
Sales Revenue Services Net			$ 400,000

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