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GENERAL (Narrative) (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 14, 2016 | Mar. 11, 2016 | Mar. 22, 2016 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 18, 2015 | Jul. 01, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill from acquisitions |  |  |  |  | $ 24,346 | [1] | $ 651,892 | [2] |  |  |
Goodwill |  |  |  | $ 1,284,710 | 1,318,242 |  | 1,284,710 |  | $ 651,112 |  |
Acquisition costs |  |  |  |  | 970 |  | 9,348 |  |  |  |
Net operating losses carryforward |  |  |  | $ 82,243 | 79,196 |  | 82,243 |  |  |  |
Depreciation expense |  |  |  |  | 0 |  | 0 |  | 724 |  |
Amortization expense |  |  |  |  | 0 |  | $ 0 |  | 4,362 |  |
Cyber and Intelligence operation [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total consideration of sale |  |  |  |  |  |  |  |  |  |  | $ 151,583
Cash in sale |  |  |  |  |  |  |  |  |  |  | 111,583
Earn out based on future business performance |  |  |  |  |  |  |  |  |  |  | $ 40,000
Capital gain |  |  |  |  |  |  |  |  | 101,847 |  |
Physical Security operation [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total consideration of sale |  |  |  |  |  |  |  |  |  | $ 92,475 |
Cash in sale |  |  |  |  |  |  |  |  |  | 74,551 |
Note receivable |  |  |  |  |  |  |  |  |  | 2,924 |
Earn out based on future business performance |  |  |  |  |  |  |  |  |  | 15,000 |
Capital gain |  |  |  |  |  |  |  |  | $ 45,487 |  |
Amount of goodwill |  |  |  |  |  |  |  |  |  | $ 35,554 |
Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred in acquisition |  |  |  |  | 76,870 |  |  |  |  |  |
Total assets acquired |  |  |  |  | 2,291 |  |  |  |  |  |
Total liabilities assumed |  |  |  |  | 51,015 |  |  |  |  |  |
Goodwill |  |  |  |  | 28,145 |  |  |  |  |  |
inContact [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill from acquisitions | $ 559,372 |  |  |  | $ 559,372 |  |  |  |  |  |
Consideration transferred in acquisition | 1,050,054 |  |  |  |  |  |  |  |  |  |
Total assets acquired | 1,240,678 |  |  |  |  |  |  |  |  |  |
Total liabilities assumed | 190,624 |  |  |  |  |  |  |  |  |  |
Goodwill | 559,372 |  |  |  |  |  |  |  |  |  |
Conversion of inContact Notes | 139,438 |  |  |  |  |  |  |  |  |  |
Cash out options and Restricted shares | $ 25,366 |  |  |  |  |  |  |  |  |  |
Dividend yield | 0.00% |  |  |  |  |  |  |  |  |  |
Percentage of consolidated total assets constituted by acquired entity |  |  |  | 4.20% |  |  | 4.20% |  |  |  |
Percentage of consolidated net income constituted by acquired entity from acquisition date |  |  |  | 1.20% |  |  |  |  |  |  |
inContact [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected life | 12 months |  |  |  |  |  |  |  |  |  |
Risk-free interest rate | 0.58% |  |  |  |  |  |  |  |  |  |
Expected volatility | 21.05% |  |  |  |  |  |  |  |  |  |
inContact [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected life | 74 months |  |  |  |  |  |  |  |  |  |
Risk-free interest rate | 1.22% |  |  |  |  |  |  |  |  |  |
Expected volatility | 25.92% |  |  |  |  |  |  |  |  |  |
Nexidia [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred in acquisition |  |  | $ 135,150 |  |  |  |  |  |  |  |
Total assets acquired |  |  | 156,892 |  |  |  |  |  |  |  |
Total liabilities assumed |  |  | 21,742 |  |  |  |  |  |  |  |
Goodwill |  |  | $ 75,647 |  |  |  |  |  |  |  |
Voiceprint International, Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill from acquisitions |  | $ 16,873 |  |  |  |  |  |  |  |  |
Customer relationships |  | 8,500 |  |  |  |  |  |  |  |  |
Consideration transferred in acquisition |  | $ 21,720 |  |  |  |  |  |  |  |  |
Expected life |  | 6 years |  |  |  |  |  |  |  |  |
[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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