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OTHER INTANGIBLE ASSETS (NARRATIVE) (DETAILS) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  | $ 7,467,000 | $ 9,531,000 |
Impairment losses | $ 5,322,000 | $ 0 | $ 0 | $ 0 | $ 26,448,000 | $ 5,602,000 | $ 0 | $ 0 | 5,322,000 | 32,050,000 | $ 8,100,000
CTS - Avaya |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  | 900,000 | 400,000 |  |  |  |  |
Impairment losses |  |  |  |  | 11,300,000 | $ 700,000 |  |  |  |  |
CSS - component held-for-sale |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  | 7,500,000 | $ 9,500,000 | $ 9,700,000
Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  | $ 0 |  |
Customer Relationships | CTS - Avaya |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  | 9,200,000 |  |  |  |  |  |
Customer Relationships | CSS - component held-for-sale |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life of intangible assets |  |  |  |  |  |  |  |  | 8 years 9 months 18 days |  |
Trade Names |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  | $ 0 |  |
Trade Names | CTS - eLoyalty |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived | 0 |  |  |  |  |  |  |  |  |  |
Impairment losses | 3,300,000 |  |  |  |  |  |  |  |  |  |
Trade Names | CSS - PRG |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment losses | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
Trade Names | CTS - Avaya |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  | 400,000 |  |  |  |  |  |
Trade Names | CSS - rogenSi |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated royalty rate |  |  |  |  |  | 2.00% |  |  |  |  |
Growth rate |  |  |  |  |  | 3.00% |  |  |  |  |
Discount rate |  |  |  |  |  | 18.20% |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  | 0 | $ 3,100,000 |  |  |  |  |
Impairment losses |  |  |  |  | 3,000,000 | $ 1,200,000 |  |  |  |  |
Trade Names | CSS - component held-for-sale |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated royalty rate |  |  |  |  |  | 3.75% |  |  |  |  |
Growth rate |  |  |  |  |  | 3.00% |  |  |  |  |
Discount rate |  |  |  |  |  | 19.20% |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  |  | $ 2,000,000 |  |  |  |  |
Impairment losses |  |  |  |  |  | $ 3,300,000 |  |  |  |  |
Trade Names | Technology Solutions Group | CTS - Avaya |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated royalty rate |  |  |  |  |  | 0.50% |  |  |  |  |
Growth rate |  |  |  |  |  | 3.00% |  |  |  |  |
Discount rate |  |  |  |  |  | 19.00% |  |  |  |  |
Other Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  |  |  |  |  |  |  | $ 0 |  |
Other Intangible Assets | CSS - component held-for-sale |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life of intangible assets |  |  |  |  |  |  |  |  | 3 years 9 months 18 days |  |
Non-compete intangible assets | CTS - Avaya |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  | 400,000 |  |  |  |  |  |
Fixed Assets | CTS - Avaya |  |  |  |  |  |  |  |  |  |  |
Weighted Average Useful Life [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  | $ 1,300,000 |  |  |  |  |  |

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