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INVESTMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Investments rollforward        
Opening balance   $ 7,971 $ 8,543 $ 8,543
Disposals during the period   (3,397)   (2,163)
Other Comprehensive Income (Loss) (pre -tax)       1,334
Statement of Operations (Loss) Income   (2,001)   257
Fair Value end of the year $ 2,573 2,573   7,971
Fair value of warrants        
Unrealized gain on available-for-sale securities, net of taxes (note 2)   (1,137)    
Cost of purchase of marketable equity securities 1,400     3,300
Unrealized (loss) gain on derivatives (note 2)   (864) 1,791  
Proceeds from sale of investments   2,663    
Unrealized loss on available-for-sale securities   900    
Unrealized gain on available-for-sale securities     1,800  
Marketable equity securities        
Investments rollforward        
Opening balance   6,404 6,749 6,749
Disposals during the period   (3,397)   (2,163)
Other Comprehensive Income (Loss) (pre -tax)       1,334
Statement of Operations (Loss) Income   (1,137)   484
Fair Value end of the year 1,870 1,870   6,404
Warrants        
Investments rollforward        
Opening balance   1,567 $ 1,794 1,794
Statement of Operations (Loss) Income   (864)   (227)
Fair Value end of the year $ 703 $ 703   $ 1,567