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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 1,521,138 | $ 1,537,454
Liabilities | (515,162) | (513,526)
Carrying value |  |
Disclosure of fair value measurement of assets [line items] |  |
Net assets (liabilities) | (177,839) | (81,932)
Carrying value | Non-current portion of debt |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | (247,551) | (233,180)
Carrying value | Trade receivables |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 11,287 | 14,848
Carrying value | Marketable securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 29,542 | 114,001
Carrying value | Other financial assets |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 28,883 | 22,399
Fair value |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | (263,675) | (259,578)
Net assets (liabilities) | (193,963) | (108,330)
Fair value | Non-current portion of debt |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | (263,675) | (259,578)
Fair value | Trade receivables |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 11,287 | 14,848
Fair value | Marketable securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 29,542 | 114,001
Fair value | Other financial assets |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 28,883 | $ 22,399

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