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GOODWILL (NARRATIVE) (Details) - USD ($) $ in Thousands | Dec. 01, 2024 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | --- | ---
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |
Goodwill |  | $ 574,383 | $ 571,197
TTEC Digital |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |
Goodwill |  | 500,369 | 498,213
TTEC Engage |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |
Goodwill, Fair Value Disclosure | $ 612,000 |  |
Goodwill | $ 73,000 | $ 74,014 | $ 72,984
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 17.00% |  |
Goodwill, Impaired, Method for Fair Value Determination | 19.7% |  |
Goodwill, Other Increase (Decrease) | $ (103,000) |  |
TTEC Engage | Measurement Input, Discount Rate [Member] |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |
Goodwill, Impaired, Method for Fair Value Determination | 6.4% |  |
Digital Recurring [Member] |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |
Goodwill, Fair Value Disclosure | $ 433,500 |  |
Goodwill | $ 310,200 |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 7.00% |  |
Goodwill, Impaired, Method for Fair Value Determination | 2.6% |  |
Goodwill, Other Increase (Decrease) | $ (30,000) |  |
Digital Recurring [Member] | Measurement Input, Discount Rate [Member] |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |
Goodwill, Impaired, Method for Fair Value Determination | 1.7% |  |
Digital Professional Services [Member] |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |
Goodwill, Fair Value Disclosure | $ 225,900 |  |
Goodwill | $ 188,000 |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 10.00% |  |
Goodwill, Impaired, Method for Fair Value Determination | 3.5% |  |
Goodwill, Other Increase (Decrease) | $ (22,100) |  |
Digital Professional Services [Member] | Measurement Input, Discount Rate [Member] |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |
Goodwill, Impaired, Method for Fair Value Determination | 3.0% |  |

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