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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Related Party Transaction Line Items |  |
Sales Revenue Services Net | $ 588,726 | $ 539,219
Airmax [Member] |  |
Related Party Transaction Line Items |  |
Purchases from Related Party | 100 | 300
Accounts Payable Due from Related Party | 88 |
Welltok |  |
Related Party Transaction Line Items |  |
Sales Revenue Services Net | 400 | 500
Unisys [Member] |  |
Related Party Transaction Line Items |  |
Sales Revenue Services Net | $ 32 | $ 200

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