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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities by Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [line items]    
Financial liabilities $ 288,948 $ 280,307
Disclosure of financial assets [line items]    
Financial assets 611,112 525,777
Trade and other payables    
Disclosure of financial liabilities [line items]    
Financial liabilities 55,768 60,253
Debt    
Disclosure of financial liabilities [line items]    
Financial liabilities 233,180 220,054
Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 459,864 327,127
Trade and receivables    
Disclosure of financial assets [line items]    
Financial assets 14,848 35,590
Marketable securities    
Disclosure of financial assets [line items]    
Financial assets 114,001 148,944
Other financial assets    
Disclosure of financial assets [line items]    
Financial assets 22,399 14,116
Amortized cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 278,939 268,137
Amortized cost | Trade and other payables    
Disclosure of financial liabilities [line items]    
Financial liabilities 45,759 48,083
Amortized cost | Debt    
Disclosure of financial liabilities [line items]    
Financial liabilities 233,180 220,054
FVTPL    
Disclosure of financial liabilities [line items]    
Financial liabilities 10,009 12,170
FVTPL | Trade and other payables    
Disclosure of financial liabilities [line items]    
Financial liabilities 10,009 12,170
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 14,773 7,152
Amortized cost | Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 0 0
Amortized cost | Trade and 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 14,773 7,152
FVTPL    
Disclosure of financial assets [line items]    
Financial assets 482,338 369,681
FVTPL | Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 459,864 327,127
FVTPL | Trade and receivables    
Disclosure of financial assets [line items]    
Financial assets 14,848 35,590
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 7,626 6,964
FVTOCI    
Disclosure of financial assets [line items]    
Financial assets 114,001 148,944
FVTOCI | Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 0 0
FVTOCI | Trade and receivables    
Disclosure of financial assets [line items]    
Financial assets 0 0
FVTOCI | Marketable securities    
Disclosure of financial assets [line items]    
Financial assets 114,001 148,944
FVTOCI | Other financial assets    
Disclosure of financial assets [line items]    
Financial assets $ 0 $ 0