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GOODWILL (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 14, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | [2]
Goodwill from acquisitions |  | $ 24,346 | [1] | $ 651,892
inContact [Member] |  |  |  |
Goodwill from acquisitions | $ 559,372 | 559,372 |  |
Adjusted goodwill |  | $ 3,799 |  |
[1] | Includes a reduction of $3,799 of goodwill in respect of 2016 acquisition resulted from a finalization of purchase price allocation.
[2] | including a goodwill balance of $559,372 related to the acquisition of inContact.

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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