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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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