GOODWILL (NARRATIVE) (DETAILS) - USD ($) $ in Thousands		3 Months Ended									12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems
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 (excluding CMS-Humanify as discussed below):Revenue projections, including revenue growth during the forecast periods ranging from (3.5)% to 16%;EBITDA margin projections held relatively flat over the forecast periods ranging from 10% to 24%;Estimated income tax rates of 15% to 40%;Estimated capital expenditures ranging from zero to $45 million; andDiscount rates ranging from 10.5% to 16.75% 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		$ 26,448	$ 5,602	$ 0	$ 0	$ 5,034	$ 3,066	$ 0	$ 0		$ 32,050	$ 8,100	$ 373
CMS - Latin America [Member]
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems
Goodwill, Impaired, Method for Fair Value Determination	For the goodwill impairment analysis, the Company calculated the fair value of the CMS - Latin America 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, a compounded annual revenue growth rate of negative 22% for 2016 followed by 6% for years 2017 through 2020, a perpetuity growth rate of 4% based on the current inflation rate combined with the GDP growth rate for the reporting unit's geographical region and a discount rate of 15.8%, which is equal to the reporting unit's equity risk premium adjusted for its size, country and company specific risk factors.
Discount rate												15.80%
Impairment losses						1,800
2016 | CMS - Latin America [Member]
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems
Growth rate											22.00%
2017 - 2020 | CMS - Latin America [Member]
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems
Growth rate												6.00%
After 2020 | CMS - Latin America [Member]
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems
Growth rate												4.00%
Humanify - reporting unit [Member] | 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 [Member] | Customer Management Services | Other Intangible Assets [Member]
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems
Impairment losses		$ 10,800
WebMetro | Customer Growth Services
ValuationAllowanceForImpairmentOfRecognizedServicingAssetsLineItems
Goodwill, Impaired, Method for Fair Value Determination	For the goodwill impairment analysis, the Company calculated the fair value of the WebMetro 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, a compounded annual revenue growth rate of 20% for the years 2016 through 2019, a perpetuity growth rate of 4.0% based on the current inflation rate combined with the GDP growth rate for the reporting unit's geographical region and a discount rate of 17.0%, which is equal to the reporting unit's equity risk premium adjusted for its size and company specific risk factors.
Impairment losses						$ 600	$ 3,100			$ 2,300