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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Total assets | $ 1,521,138 | $ 1,537,454
Liabilities | (515,162) | (513,526)
Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Net assets (liabilities) | 27,891 | 126,465
Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Net assets (liabilities) | 29,542 | 114,001
Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Net assets (liabilities) | (5,362) | 6,126
Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Net assets (liabilities) | 3,711 | 6,338
Non-recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets |  | 7,399
Non-recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets |  | 0
Non-recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets |  | 0
Non-recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets |  | 7,399
Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | (263,675) | (259,578)
Net assets (liabilities) | (193,963) | (108,330)
Fair values disclosed | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | (263,675) | (259,578)
Fair values disclosed | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 | 0
Fair values disclosed | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 | 0
Derivative assets |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities |  | (10,009)
Derivative assets | Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | (16,649) |
Derivative assets | Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 | 0
Derivative assets | Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | (16,649) | (10,009)
Derivative assets | Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 | 0
Convertible notes | Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | (263,675) | (259,578)
Convertible notes | Fair values disclosed | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | (263,675) | (259,578)
Convertible notes | Fair values disclosed | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 | 0
Convertible notes | Fair values disclosed | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 | 0
Trade receivables | Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 11,287 | 14,848
Trade receivables | Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Trade receivables | Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 11,287 | 14,848
Trade receivables | Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Trade receivables | Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 11,287 | 14,848
Marketable securities | Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 29,542 | 114,001
Marketable securities | Recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 29,542 | 114,001
Marketable securities | Recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Marketable securities | Recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 0 | 0
Marketable securities | Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 29,542 | 114,001
Other financial assets | Recurring measurements |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 3,711 | 6,338
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 | 3,711 | 6,338
Other financial assets | Fair values disclosed |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | $ 28,883 | 22,399
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
Deferred consideration | Non-recurring measurements | Quoted prices in active market |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets |  | 0
Deferred consideration | Non-recurring measurements | Significant other observable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets |  | 0
Deferred consideration | Non-recurring measurements | Significant unobservable inputs |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets |  | $ 7,399

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