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GOODWILL (NARRATIVE) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems        
Goodwill   $ 307,139   $ 301,694
Impairment losses $ 2,063 696 $ 3,569  
Other Intangible Assets        
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems        
Impairment losses 2,000      
TTEC Digital        
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems        
Goodwill   $ 74,817   66,275
TTEC Digital | Other Intangible Assets | Customer Relationships [Member]        
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems        
Impairment losses 400      
TTEC Digital | Other Intangible Assets | Intellectual Property [Member]        
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems        
Impairment losses $ 200      
Digital Consulting [Member]        
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems        
Goodwill       24,300
Goodwill, Fair Value Disclosure       $ 39,700
Fair value of a reporting unit in excess of carrying value expressed as a percentage       26.00%