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SEGMENT INFORMATION (REVENUE GEOGRAPHY) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | $ 375,249 | $ 338,277 |
Other long-term assets | 49,168 |  | $ 61,857
United States [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 209,848 | 178,432 |
Philippines [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 89,205 | 85,575 |
Latin America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 30,498 | 33,117 |
Canada [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 16,290 | 18,632 |
Europe Middle East Africa [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 15,971 | 15,410 |
Asia Pacific India[ Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | $ 13,437 | $ 7,111 |

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