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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Related Party Transaction Line Items
Sales Revenue Services Net	$ 492,980,000	$ 395,507,000	$ 1,378,274,000	$ 1,182,378,000
Airmax [Member]
Related Party Transaction Line Items
Purchases from Related Party			300,000	800,000
Accounts Payable Due from Related Party	$ 50,000		50,000
CafeX [Member]
Related Party Transaction Line Items
Purchases from Related Party			$ 0	50,000
Equity Method Investment, Ownership Percentage	17.80%		17.80%
Welltok
Related Party Transaction Line Items
Sales Revenue Services Net			$ 2,400,000	$ 4,000,000.0

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