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FINANCIAL INSTRUMENTS - (Gain)/loss on fair value of financial instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]    
Loss on fair value of 5% Convertible Debentures $ 317 $ 17,235
(Gain)/loss on fair value of warrants (86) 2,322
Gain on warrant exercise (193) 0
(Gain)/loss on fair value of 7% Convertible Debentures embedded derivative (2,095) 3,812
Unrealized loss on non-hedge derivative contracts 0 2,307
(Gain)/loss on fair value of financial instruments, net (2,057) $ 25,676
5% Convertible Debentures    
Disclosure of detailed information about financial instruments [line items]    
Loss on fair value of 5% Convertible Debentures $ (317)  
Borrowings, interest rate 5.00%  
7% Convertible Debentures    
Disclosure of detailed information about financial instruments [line items]    
Borrowings, interest rate 7.00%