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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Related Party Transaction Line Items |  |  |  |
Revenues | $ 364,936,000 | $ 359,036,000 | $ 1,090,038,000 | $ 1,050,742,000
Airmax [Member] |  |  |  |
Related Party Transaction Line Items |  |  |  |
Purchases from Related Party |  |  | 900,000 | 600,000
Accounts Payable Due from Related Party | 142,000 |  | 142,000 |
Conversent [Member] |  |  |  |
Related Party Transaction Line Items |  |  |  |
Purchases from Related Party |  |  | 45,000 | 55,000
CafeX [Member] |  |  |  |
Related Party Transaction Line Items |  |  |  |
Purchases from Related Party |  |  | 44,000 | 60,000
Motif [Member] |  |  |  |
Related Party Transaction Line Items |  |  |  |
OperatingLeasesFutureMinimumPaymentsDue | $ 105,000 |  | $ 105,000 |
Lease Expiration Date |  |  | Feb. 01, 2022 |
Welltok |  |  |  |
Related Party Transaction Line Items |  |  |  |
Revenues |  |  | $ 3,400,000 | $ 3,300,000

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