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BUSINESS ACQUISITONS - EDGEWATER NETWORKS, INC (Details) - USD ($) $ in Thousands, shares in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 24, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 08, 2019 | Feb. 15, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Cash, net of cash acquired |  | $ 0 | $ 46,389 | $ 42,951 |  |
Deferred purchase consideration |  | 0 | 30,000 |  |  |
Other income (expense), net |  | 70,444 | $ (3,772) | $ 1,274 |  |
Edgewater |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash, net of cash acquired | $ 46,400 | 46,389 |  |  |  |
Shares issued to selling shareholders (in shares) | 4.2 |  |  |  |  |
Deferred purchase consideration | $ 30,000 |  |  |  | $ 21,900 | $ 21,900
Deferred cash payments, within 6 months from closing date | 15,000 |  |  |  |  |
Deferred cash payments, within 9 to 18 months from closing date | $ 15,000 |  |  |  |  |
Other income (expense), net |  | $ 8,100 |  |  |  |
Weighted average life of identifiable intangible assets (in years) |  |  | 8 years 4 months 17 days |  |  |
Revenue attributable since acquisition |  |  | $ 21,500 |  |  |
Net loss attributable to acquisition |  |  | $ 4,300 |  |  |

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