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GOODWILL (NARRATIVE) (DETAILS) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 01, 2017
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 206,694 | $ 206,694 |  |  |  | $ 129,648 |  |  |  | $ 206,694 | $ 129,648 | $ 114,183 |
Goodwill, Impaired, Method for Fair Value Determination | The process of evaluating the fair value of the reporting units is highly subjective and requires significant judgment and estimates as the reporting units operate in a number of markets and geographical regions. We used a market approach and an income approach to determine our best estimates of fair value which incorporated the following significant assumptions:Revenue projections, including revenue growth during the forecast periods ranging from (3.2)% to 7.8%;EBITDA margin projections held relatively flat over the forecast periods ranging from 10% to 21.4%;Estimated income tax rates of 14.6% to 34.3%;Estimated capital expenditures ranging from $0.8 million to $40.4 million; andDiscount rates ranging from 10% to 16% based on various inputs, including the risks associated with the specific reporting units, the country of operations as well as their revenue growth and EBITDA margin assumptions. |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  | 5,322 | $ 0 | $ 0 | $ 0 | 26,448 | $ 5,602 | $ 0 | $ 0 | 5,322 | 32,050 | 8,100 |
Customer Management Services |  |  |  |  |  |  |  |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 119,497 | 119,497 |  |  |  | 42,589 |  |  |  | 119,497 | 42,589 | 23,218 |
Customer Strategy Services |  |  |  |  |  |  |  |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 21,919 | 21,919 |  |  |  | 21,120 |  |  |  | 21,919 | 21,120 | 25,026 | $ 22,000
Fair value of a reporting unit in excess of carrying value expressed as a percentage |  |  |  |  |  |  |  |  |  |  |  |  | 44.00%
Customer Growth Services |  |  |  |  |  |  |  |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 24,439 | 24,439 |  |  |  | 24,439 |  |  |  | 24,439 | 24,439 | 24,439 |
Customer Technology Services |  |  |  |  |  |  |  |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 40,839 | $ 40,839 |  |  |  | 41,500 |  |  |  | $ 40,839 | $ 41,500 | $ 41,500 |
Humanify - reporting unit | Customer Management Services |  |  |  |  |  |  |  |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Method for Fair Value Determination | For the goodwill impairment analysis, the Company calculated the fair value of the Humanify reporting unit and compared that to the updated carrying value and determined that the fair value was not in excess of its carrying value. Key assumptions used in the fair value calculation for goodwill impairment testing include, but are not limited to, revenue growth of approximately $300 thousand to $1 million per year through 2027, a perpetual growth rate of 3%, a discount rate of 16.75%, and negative EBITDA through 2020 growing to a 15.6% EBITDA for the terminal year |  |  |  |  |  |  |  |  |  |  |  |
Humanify - reporting unit | Customer Management Services | Other Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | $ 10,800 |  |  |  |  |  |  |

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