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SIGNIFICANT CLIENTS(NARRATIVE) (DETAILS) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) customer | Sep. 30, 2016 USD ($) customer
Entity Wide Revenue Major Customer Line Items |  |  |  |
Revenue | $ 359,036 | $ 312,796 | $ 1,050,742 | $ 930,311
Customer Management Services |  |  |  |
Entity Wide Revenue Major Customer Line Items |  |  |  |
Revenue | $ 277,373 | $ 223,664 | $ 798,508 | $ 664,392
Customer Concentration Risk | Revenue |  |  |  |
Entity Wide Revenue Major Customer Line Items |  |  |  |
Number of customers | customer |  |  | 0 | 1
Customer Concentration Risk | Revenue | Client A [Member] | Customer Management Services |  |  |  |
Entity Wide Revenue Major Customer Line Items |  |  |  |
Concentration risk percentage |  |  | 9.50% | 10.40%
Minimum | Customer Concentration Risk | Revenue |  |  |  |
Entity Wide Revenue Major Customer Line Items |  |  |  |
Revenue |  |  | $ 100,000 |

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