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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities by Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of financial assets [line items] |  |
Financial assets | $ 977,348 | $ 643,228
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 642,270 | 362,677
Trade and other payables |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 125,004 | 74,836
Debt |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 390,670 | 284,049
Lease liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 122,715 | 3,792
Derivative liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,881 |
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 860,637 | 503,647
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 26,748 | 66,453
Trade receivables |  |
Disclosure of financial assets [line items] |  |
Financial assets | 38,456 | 54,164
Restricted cash |  |
Disclosure of financial assets [line items] |  |
Financial assets | 35,288 | 2,339
Other current and non-current financial assets |  |
Disclosure of financial assets [line items] |  |
Financial assets | 16,219 | 16,625
Amortized cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 638,389 | 362,677
Amortized cost | Trade and other payables |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 125,004 | 74,836
Amortized cost | Debt |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 390,670 | 284,049
Amortized cost | Lease liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 122,715 | 3,792
Amortized cost | Derivative liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 |
FVTPL |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,881 | 0
FVTPL | Trade and other payables |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
FVTPL | Debt |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
FVTPL | Lease liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
FVTPL | Derivative liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 3,881 |
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
FVTOCI | Lease liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
FVTOCI | Derivative liabilities |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 |
Amortized cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | 901,153 | 519,323
Amortized cost | Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 860,637 | 503,647
Amortized cost | Marketable securities |  |
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 | Restricted cash |  |
Disclosure of financial assets [line items] |  |
Financial assets | 35,288 | 2,339
Amortized cost | Other current and non-current financial assets |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,228 | 13,337
FVTPL |  |
Disclosure of financial assets [line items] |  |
Financial assets | 49,447 | 56,452
FVTPL | Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
FVTPL | Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
FVTPL | Trade receivables |  |
Disclosure of financial assets [line items] |  |
Financial assets | 38,456 | 54,164
FVTPL | Restricted cash |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
FVTPL | Other current and non-current financial assets |  |
Disclosure of financial assets [line items] |  |
Financial assets | 10,991 | 2,288
FVTOCI |  |
Disclosure of financial assets [line items] |  |
Financial assets | 26,748 | 67,453
FVTOCI | Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
FVTOCI | Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 26,748 | 66,453
FVTOCI | Trade receivables |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
FVTOCI | Restricted cash |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
FVTOCI | Other current and non-current financial assets |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 0 | $ 1,000

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