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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%