RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Related Party Transaction Line Items
Sales Revenue Services Net	$ 554,794,000	$ 453,081,000	$ 1,094,013,000	$ 885,294,000
Airmax [Member]
Related Party Transaction Line Items
Purchases from Related Party			500,000	200,000
Accounts Payable Due from Related Party	$ 77,000		77,000
Welltok
Related Party Transaction Line Items
Sales Revenue Services Net			900,000	$ 1,800,000
Unisys [Member]
Related Party Transaction Line Items
Sales Revenue Services Net			$ 300,000