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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 1,537,454 | $ 1,438,688
Total liabilities | (513,526) | (536,809)
Carrying value |  |
Disclosure of fair value measurement of assets [line items] |  |
Net assets (liabilities) | (81,932) | (20,758)
Carrying value | Non-current portion of debt |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | (233,180) | (220,054)
Carrying value | Trade and receivables |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 14,848 | 36,236
Carrying value | Marketable securities (note 6) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 114,001 | 148,944
Carrying value | Other financial assets |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 22,399 | 14,116
Fair value |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | (259,578) | (245,515)
Net assets (liabilities) | (108,330) | (46,219)
Fair value | Non-current portion of debt |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 259,578 | (245,515)
Fair value | Trade and receivables |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 14,848 | 36,236
Fair value | Marketable securities (note 6) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 114,001 | 148,944
Fair value | Other financial assets |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 22,399 | $ 14,116

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