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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities by Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]    
Financial liabilities $ 317,554 $ 288,948
Disclosure of financial assets [line items]    
Financial assets 488,924 611,112
Trade and other payables    
Disclosure of financial liabilities [line items]    
Financial liabilities 70,003 55,768
Debt    
Disclosure of financial liabilities [line items]    
Financial liabilities 247,551 233,180
Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 419,212 459,864
Trade receivables    
Disclosure of financial assets [line items]    
Financial assets 11,287 14,848
Marketable securities    
Disclosure of financial assets [line items]    
Financial assets 29,542 114,001
Other financial assets    
Disclosure of financial assets [line items]    
Financial assets 28,883 22,399
Amortized cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 301,669 278,939
Amortized cost | Trade and other payables    
Disclosure of financial liabilities [line items]    
Financial liabilities 54,118 45,759
Amortized cost | Debt    
Disclosure of financial liabilities [line items]    
Financial liabilities 247,551 233,180
FVTPL    
Disclosure of financial liabilities [line items]    
Financial liabilities 15,885 10,009
FVTPL | Trade and other payables    
Disclosure of financial liabilities [line items]    
Financial liabilities 15,885 10,009
FVTPL | Debt    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
FVTOCI    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
FVTOCI | Trade and other payables    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
FVTOCI | Debt    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Amortized cost    
Disclosure of financial assets [line items]    
Financial assets 25,172 14,773
Amortized cost | Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 0 0
Amortized cost | Trade receivables    
Disclosure of financial assets [line items]    
Financial assets 0 0
Amortized cost | Marketable securities    
Disclosure of financial assets [line items]    
Financial assets 0 0
Amortized cost | Other financial assets    
Disclosure of financial assets [line items]    
Financial assets 25,172 14,773
FVTPL    
Disclosure of financial assets [line items]    
Financial assets 434,210 482,338
FVTPL | Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 419,212 459,864
FVTPL | Trade receivables    
Disclosure of financial assets [line items]    
Financial assets 11,287 14,848
FVTPL | Marketable securities    
Disclosure of financial assets [line items]    
Financial assets 0 0
FVTPL | Other financial assets    
Disclosure of financial assets [line items]    
Financial assets 3,711 7,626
FVTOCI    
Disclosure of financial assets [line items]    
Financial assets 29,542 114,001
FVTOCI | Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 0 0
FVTOCI | Trade receivables    
Disclosure of financial assets [line items]    
Financial assets 0 0
FVTOCI | Marketable securities    
Disclosure of financial assets [line items]    
Financial assets 29,542 114,001
FVTOCI | Other financial assets    
Disclosure of financial assets [line items]    
Financial assets $ 0 $ 0