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FINANCIAL RISK MANAGEMENT - Liquidity Risk (Details) - Liquidity risk - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables $ 70,003 $ 52,590
Moratorium 19,057 46,037
Notes 265,000 265,000
Interest on convertible notes 11,428 19,047
Total contractual obligations 365,488 $ 382,674
Less than one year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 70,003  
Moratorium 4,570  
Notes 0  
Interest on convertible notes 7,619  
Total contractual obligations 82,192  
1 - 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 0  
Moratorium 14,487  
Notes 265,000  
Interest on convertible notes 3,809  
Total contractual obligations 283,296  
4-5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 0  
Moratorium 0  
Notes 0  
Interest on convertible notes 0  
Total contractual obligations 0  
After 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 0  
Moratorium 0  
Notes 0  
Interest on convertible notes 0  
Total contractual obligations $ 0