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ACQUISITIONS AND DIVESTITURES 4 (NARRATIVE) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 22, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Gain on sale of business |  |  |  |  |  |  |  | $ 3,323
Impairment losses |  |  |  |  |  |  | $ 1,120 |
Proceeds from sale of business |  |  |  |  |  |  |  | 391
Other nonoperating income expense |  |  | $ 989 |  | $ 4,416 |  | (8,786) | $ 6,573
Technology Solutions Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Gain on sale of business |  |  |  |  |  | $ 30 |  |
Impairment losses |  |  |  |  |  | $ 700 |  |
Proceeds from sale of business |  | $ 250 |  |  | 141 |  |  |
TeleTech Spain Holdings SL [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Other nonoperating income expense |  |  |  |  | $ 3,200 |  |  |
Customer Growth Services [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of business | $ 245 |  |  | $ 600 |  |  |  |
Customer Technology Services [Member] | Technology Solutions Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Other nonoperating income expense |  |  | $ 588 |  |  |  | $ 1,650 |

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