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GOODWILL (NARRATIVE) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 01, 2024 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | $ 37,500 | $ 233,532 |  |
Goodwill |  | $ 571,197 |  | 571,197 | $ 808,988 | $ 807,845
Deferred Tax Assets, Net of Valuation Allowance |  | 15,620 |  | 15,620 | 100,206 |
Goodwill, Other Increase (Decrease) |  |  |  | $ 0 | 0 |
Revenue Projections [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | (7.5)% |  |
Revenue Projections [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 15.0% |  |
Revenue Terminal Growth [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 1.8% |  |
Revenue Terminal Growth [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 3.0% |  |
EBITDA Margin [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 9.0% |  |
EBITDA Margin [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 18.0% |  |
Income Tax Rate [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 25.4% |  |
Income Tax Rate [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 26.5% |  |
Working Capital [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 3.1% |  |
Working Capital [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 14.3% |  |
Capital Expenditure [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 1.0% |  |
Capital Expenditure [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 3.0% |  |
Discount Rate Range [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 13.5% |  |
Discount Rate Range [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 16.5% |  |
Public Company Revenue Multiples [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 0.35 |  |
Public Company Revenue Multiples [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 1.50 |  |
EBITDA Multiples [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 4.0 |  |
EBITDA Multiples [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 13.0 |  |
Transaction Revenue Multiples [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 0.2 |  |
Transaction Revenue Multiples [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 9.8 |  |
Market participant acquisition premiums [Member] | Minimum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 0.6% |  |
Market participant acquisition premiums [Member] | Maximum [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination |  |  |  | 113% |  |
TTEC Digital |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill |  | 498,213 |  | $ 498,213 | 500,576 | 502,806
Goodwill, Other Increase (Decrease) |  |  |  | 0 | (2,763) |
TTEC Engage |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Fair Value Disclosure |  | 612,000 |  | 612,000 |  |
Goodwill, Impairment Loss |  |  |  | 233,532 |  |
Goodwill |  | $ 72,984 |  | $ 72,984 | 308,412 | $ 305,039
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  | 17.00% |  | 17.00% |  |
Goodwill, Impaired, Method for Fair Value Determination |  | 19.7% |  |  |  |
Goodwill, Other Increase (Decrease) |  | $ (103,000) |  | $ 0 | $ 2,763 |
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% |  |  |  |
TTEC Engage | Non-cash pre-tax [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | 196,000 |  |  |
TTEC Engage | Incremental Deferred Tax Asset [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance |  |  | $ 37,500 |  |  |
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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