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SEGMENT INFORMATION (REVENUE GEOGRAPHY) (DETAILS) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net | $ 426,623 | $ 359,036 | $ 353,429 | $ 338,277 | $ 344,947 | $ 312,796 | $ 305,105 | $ 312,410 | $ 1,477,365 | $ 1,275,258 | $ 1,286,755
Property, plant and equipment, gross | 729,979 |  |  |  | 677,318 |  |  |  | 729,979 | 677,318 | 660,081
Other long-term assets | 61,857 |  |  |  | 47,520 |  |  |  | 61,857 | 47,520 | 42,486
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  |  |  |  |  |  |  | 820,597 | 693,023 | 679,959
Property, plant and equipment, gross | 490,110 |  |  |  | 441,222 |  |  |  | 490,110 | 441,222 | 415,918
Other long-term assets | 46,029 |  |  |  | 36,442 |  |  |  | 46,029 | 36,442 | 34,007
Philippines |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  |  |  |  |  |  |  | 353,122 | 351,853 | 343,013
Property, plant and equipment, gross | 137,683 |  |  |  | 133,214 |  |  |  | 137,683 | 133,214 | 140,712
Other long-term assets | 7,753 |  |  |  | 8,194 |  |  |  | 7,753 | 8,194 | 5,220
Latin America |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  |  |  |  |  |  |  | 130,082 | 122,347 | 147,267
Property, plant and equipment, gross | 51,451 |  |  |  | 50,605 |  |  |  | 51,451 | 50,605 | 49,464
Other long-term assets | 1,475 |  |  |  | 1,161 |  |  |  | 1,475 | 1,161 | 1,161
Canada |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  |  |  |  |  |  |  | 74,252 | 13,950 | 5,780
Property, plant and equipment, gross | 15,912 |  |  |  | 19,988 |  |  |  | 15,912 | 19,988 | 16,239
Other long-term assets | 324 |  |  |  | 514 |  |  |  | 324 | 514 | 1,122
Europe Middle East Africa |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  |  |  |  |  |  |  | 62,597 | 65,866 | 78,182
Property, plant and equipment, gross | 10,231 |  |  |  | 8,805 |  |  |  | 10,231 | 8,805 | 14,567
Other long-term assets | 1,950 |  |  |  | 1,099 |  |  |  | 1,950 | 1,099 | 811
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  |  |  |  |  |  |  | 36,715 | 28,219 | 32,554
Property, plant and equipment, gross | 24,592 |  |  |  | 23,484 |  |  |  | 24,592 | 23,484 | 23,181
Other long-term assets | $ 4,326 |  |  |  | $ 110 |  |  |  | $ 4,326 | $ 110 | $ 165

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