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GOODWILL (GOODWILL ROLLFORWARD) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |
Beginning balance, goodwill | $ 363,502 | $ 301,694
Acquisitions / Adjustments Increase (Decrease) | 378,908 | 59,087
Effect of Foreign Currency | (2,929) | 2,721
Ending balance, goodwill | 739,481 | 363,502
TTEC Digital |  |
Goodwill [Line Items] |  |
Beginning balance, goodwill | 128,211 | 66,275
Acquisitions / Adjustments Increase (Decrease) | 378,908 | 59,341
Effect of Foreign Currency | (1,897) | 2,595
Ending balance, goodwill | 505,222 | 128,211
TTEC Engage |  |
Goodwill [Line Items] |  |
Beginning balance, goodwill | 235,291 | 235,419
Acquisitions / Adjustments Increase (Decrease) | 0 | (254)
Effect of Foreign Currency | (1,032) | 126
Ending balance, goodwill | $ 234,259 | $ 235,291

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