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SIGNIFICANT CLIENTS(NARRATIVE) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) customer | Mar. 31, 2017 USD ($)
Entity Wide Revenue Major Customer Line Items |  |
Revenue | $ 375,249 | $ 338,277
Customer Management Services [Member] |  |
Entity Wide Revenue Major Customer Line Items |  |
Revenue | $ 292,641 |
Customer Concentration Risk | Client A [Member] |  |
Entity Wide Revenue Major Customer Line Items |  |
Number of customers | customer | 1 |
Customer Concentration Risk | Revenue | Client A [Member] | Customer Management Services [Member] |  |
Entity Wide Revenue Major Customer Line Items |  |
Concentration risk percentage | 11.30% | 2.90%
Minimum | Customer Concentration Risk | Revenue |  |
Entity Wide Revenue Major Customer Line Items |  |
Revenue | $ 100,000 |

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