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OTHER INTANGIBLE ASSETS (NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Weighted Average Useful Life [Line Items] |  |  |  |
Amortization expense related to intangible assets |  | $ 31,969 | $ 16,186 |
Impairment losses |  | 11,254 | 5,809 | $ 3,735
rogenSi [Member] | TTEC Digital |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |
Amortization expense related to intangible assets |  | 32,000 | 16,200 | $ 10,500
Impairment losses | $ 2,000 |  |  |
Customer Relationships [Member] |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |
Amortization expense related to intangible assets |  | $ 0 | 0 |
Customer Relationships [Member] | rogenSi [Member] | TTEC Digital |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |
Weighted average useful life of intangible assets |  | 7 years 1 month 6 days |  |
Impairment losses | 400 |  |  |
Other Intangible Assets [Member] |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |
Amortization expense related to intangible assets |  | $ 0 | $ 0 |
Other Intangible Assets [Member] | rogenSi [Member] | TTEC Digital |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |
Weighted average useful life of intangible assets |  | 1 year 3 months 18 days |  |
Intellectual Property [Member] | rogenSi [Member] | TTEC Digital |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |
Impairment losses | $ 200 |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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