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INVESTMENTS (Disclosure of Detailed Information about Financial Instruments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]    
Non-current investments, beginning $ 61,293 $ 26,580
Net Additions (Disposals)   (4,282)
Transfers in (out)  
Fair Value Adjustment in Net Income (Loss) 5,827 22,093
Fair Value Adjustment in Other Comprehensive Income (Loss) 8,159 16,902
Fair Value Adjustment   38,995
Current investments, ending 18,252  
Non-current investments, ending 60,630 61,293
Non-Current [Member]    
Disclosure of financial assets [line items]    
Non-current investments, beginning 61,293  
Net Additions (Disposals) 3,603  
Transfers in (out) (18,252)  
Fair Value Adjustment 13,986  
Non-current investments, ending 60,630 61,293
Short-Term [Member]    
Disclosure of financial assets [line items]    
Transfers in (out) 18,252  
Current investments, ending 18,252  
Covertible Debt [member] | Non-Current [Member]    
Disclosure of financial assets [line items]    
Non-current investments, beginning 29,039 11,555
Net Additions (Disposals) (1,383)  
Transfers in (out) (15,000)
Fair Value Adjustment in Net Income (Loss) 3,939 17,484
Non-current investments, ending 16,595 29,039
Covertible Debt [member] | Short-Term [Member]    
Disclosure of financial assets [line items]    
Transfers in (out) 15,000  
Current investments, ending 15,000  
Common Shares Held [member] | Non-Current [Member]    
Disclosure of financial assets [line items]    
Non-current investments, beginning 28,850 14,990
Net Additions (Disposals) 6,965 (3,042)
Transfers in (out) (3,252)
Fair Value Adjustment in Other Comprehensive Income (Loss) 8,159 16,902
Non-current investments, ending 40,722 28,850
Common Shares Held [member] | Short-Term [Member]    
Disclosure of financial assets [line items]    
Transfers in (out) 3,252  
Current investments, ending 3,252  
Warrants [member] | Non-Current [Member]    
Disclosure of financial assets [line items]    
Non-current investments, beginning 3,404 35
Net Additions (Disposals) (1,979) (1,240)
Transfers in (out)  
Fair Value Adjustment in Net Income (Loss) 1,888 4,609
Non-current investments, ending 3,313 3,404
Equity Securities and Warrants and Debt Securities [member]    
Disclosure of financial assets [line items]    
Total investments at beginning of period 61,293  
Net Additions (Disposals) 3,603  
Fair Value Adjustment 13,986  
Total investments at end of period $ 78,882 $ 61,293