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ACCOUNTS RECEIVABLE (SIGNIFICANT CLIENTS TABLE) (DETAILS) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Entity Wide Revenue Major Customer Line Items |  |  |
Accounts receivable amount from major customer | 38,400ttec_EntityWideAccountsReceivableMajorCustomerAmount | 24,120ttec_EntityWideAccountsReceivableMajorCustomerAmount | 25,471ttec_EntityWideAccountsReceivableMajorCustomerAmount
Sales |  |  |
Concentration Risk, Percentage of Revenue from Major Customer |  |  |
Revenue from major customer as a percentage of total revenue | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember

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- Definition Amount of accounts receivable balance from revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
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- Details
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