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DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Oct. 17, 2019
Dec. 31, 2018
Dec. 31, 2017
Aug. 03, 2016
Disclosure of detailed information about borrowings [line items]          
Current portion $ 15,987   $ 27,482    
Long term portion 90,782   73,224    
Total 106,769   100,706    
Lease liabilities          
Disclosure of detailed information about borrowings [line items]          
Current portion 987   1,151    
Long term portion 1,394   532    
Ecobank Loan III          
Disclosure of detailed information about borrowings [line items]          
Current portion 0   5,555    
Long term portion 0   14,380    
Ecobank Loan IV          
Disclosure of detailed information about borrowings [line items]          
Current portion 0   4,000    
Long term portion 0   13,700    
7% Convertible Debentures          
Disclosure of detailed information about borrowings [line items]          
Long term portion 47,002   44,612    
Total $ 47,002   44,612 $ 42,515  
Borrowings, interest rate 7.00%       7.00%
Vendor agreement          
Disclosure of detailed information about borrowings [line items]          
Current portion $ 0   16,776    
Borrowings, interest rate 7.50%        
Macquarie Credit Facility          
Disclosure of detailed information about borrowings [line items]          
Current portion $ 15,000   0    
Long term portion $ 42,386   $ 0    
Borrowings, interest rate   4.50%