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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 |

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