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SIGNIFICANT CLIENTS(NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Entity Wide Revenue Major Customer Line Items |  |  |  |
Revenue | $ 349,853 | $ 353,429 | $ 725,102 | $ 691,706
Customer Management Services [Member] |  |  |  |
Entity Wide Revenue Major Customer Line Items |  |  |  |
Revenue | $ 262,213 |  |  |
Customer Concentration Risk |  |  |  |
Entity Wide Revenue Major Customer Line Items |  |  |  |
Concentration risk percentage |  |  | 10.00% |
Minimum | Customer Concentration Risk | Revenue |  |  |  |
Entity Wide Revenue Major Customer Line Items |  |  |  |
Revenue |  |  | $ 100,000 |

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