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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Related Party Transaction Line Items |  |
Revenues | $ 394,356,000 | $ 375,249,000
Airmax [Member] |  |
Related Party Transaction Line Items |  |
Purchases from Related Party | 300,000 | 300,000
Accounts Payable Due from Related Party | 170,000 |
Convercent [Member] |  |
Related Party Transaction Line Items |  |
Purchases from Related Party | 15,000 | 15,000
CafeX [Member] |  |
Related Party Transaction Line Items |  |
Purchases from Related Party | $ 16,000 | 15,000
Motif [Member] |  |
Related Party Transaction Line Items |  |
Lease Expiration Date | Mar. 31, 2019 |
Welltok |  |
Related Party Transaction Line Items |  |
Revenues | $ 1,400,000 | $ 800,000

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