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GOODWILL (NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |
Goodwill | $ 345,119 |  |  | $ 345,119 |  | $ 301,694
Impairment losses | 948 |  |  | 1,644 | $ 3,569 |
Other Intangible Assets |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |
Impairment losses |  |  | $ 2,000 |  |  |
TTEC Digital |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |
Goodwill | $ 111,382 |  |  | $ 111,382 |  | $ 66,275
TTEC Digital | Other Intangible Assets | Customer Relationships [Member] |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |
Impairment losses |  | $ 400 |  |  |  |
TTEC Digital | Other Intangible Assets | Intellectual Property [Member] |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |
Impairment losses |  | $ 200 |  |  |  |

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