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FINANCIAL RISK MANAGEMENT - Liquidity Risk (Details) - Liquidity risk - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables $ 52,590 $ 60,253
Moratorium 46,037 67,130
Notes 265,000 265,000
Interest on convertible notes 19,047 26,666
Total contractual obligations 382,674 $ 419,049
Less than one year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 52,590  
Moratorium 9,085  
Notes 0  
Interest on convertible notes 7,619  
Total contractual obligations 69,294  
1 - 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 0  
Moratorium 36,952  
Notes 265,000  
Interest on convertible notes 11,428  
Total contractual obligations 313,380  
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