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FAIR VALUE (NARRATIVE) (DETAILS) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Average interest rate on annual borrowings |  |  |  |  |  | 2.20% | 1.50%
Iknowtion |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Discount rate |  |  |  |  |  | 21.00% |
Sofica [Member] |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Discount rate |  |  |  |  |  | 5.00% |
Increase (decrease) in contingent consideration payable |  |  |  |  | $ 0.5 |  |
rogenSi |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Discount rate |  |  |  |  |  | 4.60% |
Increase (decrease) in contingent consideration payable |  | $ 4.3 | $ 0.3 | $ 0.8 |  |  |
Atelka [Member] |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |
Discount rate |  |  |  |  |  | 0.00% |
Increase (decrease) in contingent consideration payable | $ 0.6 |  |  |  |  |  |

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