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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