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RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Transaction Line Items |  |  |
Sales Revenue Services Net | $ 2,273,062 | $ 1,949,248 | $ 1,643,704
Airmax [Member] |  |  |
Related Party Transaction Line Items |  |  |
Purchases from Related Party | 600 | 400 | 1,100
Accounts Payable Due from Related Party | 50 |  |
Welltok |  |  |
Related Party Transaction Line Items |  |  |
Sales Revenue Services Net | 1,500 | $ 3,000 | $ 5,300
Unisys [Member] |  |  |
Related Party Transaction Line Items |  |  |
Sales Revenue Services Net | $ 400 |  |

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