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SEGMENT INFORMATION (REVENUE GEOGRAPHY) (DETAILS) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | $ 338,277 | $ 312,410 |
Other long-term assets | 57,883 |  | $ 47,520
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 178,432 | 174,577 |
Philippines [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 85,575 | 84,296 |
Latin America |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 33,117 | 30,158 |
Europe Middle East Africa [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 15,410 | 16,492 |
Asia Pacific[ Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | 7,111 | 5,650 |
Canada |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales Revenue Services Net | $ 18,632 | $ 1,237 |

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