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LONG TERM DEBT (Schedule of Interest Expense Related) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amortization of debt issuance costs | $ 13,547 | $ 379 |
Interest expense | 9,580 | $ 1,861 | $ 66
Exchangeable Notes [Member] |  |  |
Amortization of debt issuance costs | 609 |  |
Non-cash amortization of debt discount | 6,278 |  |
Interest expense | 3,414 |  |
Net liability carrying amount | $ 10,301 |  |
Equity component - net carrying value | 4.68% |  |

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