RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($)	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction Line Items
Sales Revenue Services Net	$ 539,219,000	$ 432,213,000
Airmax [Member]
Related Party Transaction Line Items
Purchases from Related Party	300,000	100,000
Accounts Payable Due from Related Party	255,000
Welltok
Related Party Transaction Line Items
Sales Revenue Services Net	$ 500,000	$ 900,000

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details