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SIGNIFICANT CLIENTS(NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Entity Wide Revenue Major Customer Line Items |  |
Revenue | $ 394,356 | $ 375,249
Customer Management Services [Member] |  |
Entity Wide Revenue Major Customer Line Items |  |
Revenue | 289,569 | $ 292,641
Sears |  |
Entity Wide Revenue Major Customer Line Items |  |
Accounts receivable amount from major customer | $ 2,700 |
Customer Concentration Risk |  |
Entity Wide Revenue Major Customer Line Items |  |
Concentration risk percentage | 10.00% |
Customer Concentration Risk | Healthcare client |  |
Entity Wide Revenue Major Customer Line Items |  |
Concentration risk percentage | 11.10% | 11.30%
Minimum | Customer Concentration Risk | Revenue |  |
Entity Wide Revenue Major Customer Line Items |  |
Revenue | $ 100,000 |

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