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LONG TERM DEBT (Schedule of Carring Values) (Details) (USD $) - Exchangeable Notes [Member] - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 31, 2017
--- | --- | --- | ---
Principal | $ 287,500 | $ 287,500 | $ 287,500
Less: Debt issuance costs, net of amortization | (4,488) | (5,182) |
Unamortized discount | (39,335) | (46,190) |
Net liability carrying amount | 243,677 | 236,128 |
Equity component - net carrying value | $ 51,176 | $ 51,176 |

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