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CONVERTIBLE NOTES (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Capped Call Transactions |  | $ 45,338 |
Convertible Notes [Member] |  |  |
Principal amount |  | $ 442,750 |
Coupon rate |  | 0.00% |
Maturity date |  | Jan. 01, 2023 |
Conversion rate |  | $ 7.0113 |
Carrying amount of equity component representing conversion option |  | $ 105,375 |
Effective interest rate |  | 6.20% |
Debt issuance costs |  | $ 11,511 |
Issuance costs attributable to liability component |  | 9,602 |
Convertible Notes [Member] | Third Party Consultants [Member] |  |  |
Debt issuance costs |  | 1,090 |
Convertible Notes [Member] | Ordinary Shares [Member] |  |  |
Principal amount |  | $ 1,000 |
Conversion rate |  | $ 142.63 |

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