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ACQUISITIONS AND DIVESTITURES 3 (NARRATIVE) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of business |  |  |  |  |  |  |  |  | $ 700 |  |  | $ 0 | $ 0 | $ 908 |
Non-cash loss on assets held for sale reclassified to assets held and used |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,616 | 0 |
Impairment losses |  | $ 166 | $ 0 | $ 2,063 | $ 1,506 | $ 332 | $ 0 | $ 0 | $ 1,120 |  |  | 3,735 | 1,452 | 5,322 |
Proceeds from sale of business |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 636 |
Other nonoperating income expense |  |  |  |  |  |  |  |  |  |  |  | $ 3,902 | $ (11,618) | $ 1,869 |
TTEC Engage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,600
Loss on assets held-for-sale |  |  |  |  |  |  |  |  |  |  | $ 3,200 |  |  |  |
Gain on sale of business |  |  |  |  |  |  |  |  |  | $ 600 |  |  |  |  |
Proceeds from sale of business | $ 245 |  |  |  |  |  |  |  |  |  |  |  |  |  |
TTEC Digital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,700
Loss on assets held-for-sale |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |
Gain on sale of business |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |
Non-cash loss on assets held for sale reclassified to assets held and used |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |

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