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SEGMENT INFORMATION (REVENUE GEOGRAPHY) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Sales Revenue Services Net | $ 349,853 | $ 353,429 | $ 725,102 | $ 691,706 |
Other long-term assets | 43,489 |  | $ 43,489 |  | $ 61,857
United States [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Sales Revenue Services Net | 188,744 | 194,209 |  |  |
Philippines [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Sales Revenue Services Net | 85,442 | 85,847 |  |  |
Latin America [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Sales Revenue Services Net | 27,224 | 31,823 |  |  |
Europe Middle East Africa [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Sales Revenue Services Net | 18,469 | 15,253 |  |  |
Canada [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Sales Revenue Services Net | 15,835 | 18,466 |  |  |
Asia Pacific India[ Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Sales Revenue Services Net | $ 14,139 | $ 7,831 |  |  |

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