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COMMITMENTS AND CONTINGENCIES (NARRATIVE) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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COMMITMENTS AND CONTINGENCIES [Abstract] |
Letters of credit issued under credit facility | $ 3.1
Letters Of Credit Issued Outside Line Of Credit Facility | $ 0.5

X
- Definition Amount of letters of credit issued outside of the credit facility. Also includes contract performance guarantees. + References No definition available. + Details
Name: | ttec_LettersOfCreditIssuedOutsideLineOfCreditFacility
Namespace Prefix: | ttec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of letters of credit issued under the credit facility that reduces the total amount of borrowings available under the credit facility. + References No definition available. + Details
Name: | ttec_LineOfCreditFacilityLettersOfCreditIssued
Namespace Prefix: | ttec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration