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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Total assets | $ 1,537,454 | $ 1,438,688
Total liabilities | (513,526) | (536,809)
Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 126,465 | 179,328
Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 114,001 | 146,887
Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 6,126 | 23,420
Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 6,338 | 9,021
Non-recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 7,399 | 7,152
Non-recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Non-recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Non-recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 7,399 | 7,152
Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | (259,578) | (245,515)
Fair values disclosed | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | (259,578) | (245,515)
Fair values disclosed | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 0 | 0
Fair values disclosed | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 0 | 0
Accrued liabilities | Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | (10,009) | (12,170)
Accrued liabilities | Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 0 | 0
Accrued liabilities | Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | (10,009) | (12,170)
Accrued liabilities | Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 0 | 0
Convertible notes | Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | (259,578) | (245,515)
Convertible notes | Fair values disclosed | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 259,578 | (245,515)
Convertible notes | Fair values disclosed | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 0 | 0
Convertible notes | Fair values disclosed | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total liabilities | 0 | 0
Trade and receivables | Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 14,848 | 35,590
Trade and receivables | Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Trade and receivables | Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 14,848 | 35,590
Trade and receivables | Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Trade and receivables | Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 14,848 | 36,236
Marketable securities (note 6) | Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 114,001 | 148,944
Marketable securities (note 6) | Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 114,001 | 146,887
Marketable securities (note 6) | Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Marketable securities (note 6) | Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 2,057
Marketable securities (note 6) | Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 114,001 | 148,944
Other financial assets | Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 6,338 | 6,964
Other financial assets | Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Other financial assets | Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Other financial assets | Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 6,338 | 6,964
Other financial assets | Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 22,399 | 14,116
Derivative assets | Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 1,287 |
Derivative assets | Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Derivative assets | Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 1,287 |
Derivative assets | Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 |
Deferred consideration | Non-recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 7,399 | 7,152
Deferred consideration | Non-recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Deferred consideration | Non-recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Deferred consideration | Non-recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | $ 7,399 | $ 7,152

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