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OTHER INTANGIBLE ASSETS (NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  | $ 11,596 | $ 10,758 |
Impairment losses | $ 166 | $ 0 | $ 2,063 | $ 1,506 | $ 332 | $ 0 | $ 0 | $ 1,120 | 3,735 | 1,452 | $ 5,322
rogenSi [Member] | TTEC Digital |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  | 10,500 | $ 10,800 | $ 7,500
Impairment losses |  |  | 2,000 |  |  |  |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  | $ 0 |  |
Customer Relationships [Member] | rogenSi [Member] | TTEC Digital |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life of intangible assets |  |  |  |  |  |  |  |  | 8 years 2 months 12 days |  |
Impairment losses |  |  | 400 |  |  |  |  |  |  |  |
Other Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  | $ 0 |  |
Other Intangible Assets [Member] | rogenSi [Member] | TTEC Digital |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life of intangible assets |  |  |  |  |  |  |  |  | 5 years 6 months |  |
Intellectual Property [Member] | rogenSi [Member] | TTEC Digital |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  | $ 200 |  |  |  |  |  |  |  |

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