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SEGMENT INFORMATION (REVENUE GEOGRAPHY) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | $ 364,936 | $ 359,036 | $ 1,090,038 | $ 1,050,742 |
Other long-term assets | 67,327 |  | 67,327 |  | $ 61,857
United States [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 206,433 | 197,664 | 605,024 | 570,305 |
Philippines [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 85,272 | 86,938 | 259,919 | 258,360 |
Latin America [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 26,351 | 31,361 | 84,073 | 96,301 |
Europe Middle East Africa [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 16,112 | 14,892 | 50,552 | 45,555 |
Canada [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | 15,400 | 18,937 | 47,525 | 56,035 |
Asia Pacific India[ Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Revenues | $ 15,368 | $ 9,244 | $ 42,945 | $ 24,186 |

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