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Financial Risk Management - Financial Instruments and Classification Within the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents |  | $ 1,554,299 | $ 428,361 |
Other investments - current |  | 210,376 | 487,734 |
Derivative financial instruments | [1] | 19,929 | 9,225 |
Other investments - non-current |  | 24,934 | 118,155 |
Current trade receivables |  | 1,348,160 | 1,737,366 | $ 1,214,060
Other receivables | [2] | 261,678 | 307,790 |
Total |  |  |  |
Liabilities |  |  |  |
Borrowings C and NC |  | 822,152 | 539,007 |
Trade payables |  | 555,887 | 693,673 |
Finance Lease Liabilities C and NC |  | 230,167 | 234,149 |
Derivative financial instruments |  | 1,814 | 11,978 |
Total |  |  |  |
Derivative liabilities [member] |  |  |  |
Liabilities |  |  |  |
Derivative financial instruments |  | 1,814 | 11,978 |
Derivatives [member] |  |  |  |
Assets |  |  |  |
Derivative financial instruments |  | 19,929 | 9,173 |
Other receivables [member] |  |  |  |
Assets |  |  |  |
Other receivables |  | 141,898 | 188,185 |
Other receivables (non-Financial) [member] |  |  |  |
Assets |  |  |  |
Other receivables |  | 119,780 | 119,605 |
Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 65,874 | 300,410 |
Certificates of Deposits [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 20,637 | 198,912 |
Commercial Papers [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 4,993 | 9,932 |
Other notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 40,244 | 91,566 |
Bonds and other fixed income [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 144,502 | 187,324 |
Other investments - non-current |  | 18,012 | 113,829 |
U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 10,211 | 1,077 |
Non - U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 28,637 | 24,912 |
Corporates securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 105,654 | 142,176 |
Structured Notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  | 19,159 |
Other investments [member] |  |  |  |
Assets |  |  |  |
Other investments - non-current |  | 6,922 | 4,326 |
Level 1 of fair value hierarchy [member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  | 1,166,697 | 160,198 |
Other investments - current |  | 134,990 | 168,165 |
Other investments - non-current |  | 18,012 | 113,830 |
Current trade receivables |  |  |  |
Other receivables | [2] |  |  |
Total |  | 1,319,699 | 442,193 |
Liabilities |  |  |  |
Borrowings C and NC |  |  |  |
Trade payables |  |  |  |
Finance Lease Liabilities C and NC |  |  |  |
Total |  |  |  |
Level 1 of fair value hierarchy [member] | Derivative liabilities [member] |  |  |  |
Liabilities |  |  |  |
Derivative financial instruments |  |  |  |
Level 1 of fair value hierarchy [member] | Derivatives [member] |  |  |  |
Assets |  |  |  |
Derivative financial instruments |  |  |  |
Level 1 of fair value hierarchy [member] | Other receivables [member] |  |  |  |
Assets |  |  |  |
Other receivables |  |  |  |
Level 1 of fair value hierarchy [member] | Other receivables (non-Financial) [member] |  |  |  |
Assets |  |  |  |
Other receivables |  |  |  |
Level 1 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 1 of fair value hierarchy [member] | Certificates of Deposits [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 1 of fair value hierarchy [member] | Commercial Papers [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 1 of fair value hierarchy [member] | Other notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 1 of fair value hierarchy [member] | Bonds and other fixed income [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 134,990 | 168,165 |
Other investments - non-current |  | 18,012 | 113,830 |
Level 1 of fair value hierarchy [member] | U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 10,211 | 1,077 |
Level 1 of fair value hierarchy [member] | Non - U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 19,125 | 24,912 |
Level 1 of fair value hierarchy [member] | Corporates securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 105,654 | 142,176 |
Level 1 of fair value hierarchy [member] | Structured Notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 1 of fair value hierarchy [member] | Other investments [member] |  |  |  |
Assets |  |  |  |
Other investments - non-current |  |  |  |
Level 2 of fair value hierarchy [member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Other investments - current |  | 9,512 | 19,159 |
Other investments - non-current |  |  |  |
Current trade receivables |  |  |  |
Other receivables | [2] |  | 52 |
Total |  | 29,441 | 28,384 |
Liabilities |  |  |  |
Borrowings C and NC |  |  |  |
Trade payables |  |  |  |
Finance Lease Liabilities C and NC |  |  |  |
Total |  | 1,814 | 11,978 |
Level 2 of fair value hierarchy [member] | Derivative liabilities [member] |  |  |  |
Liabilities |  |  |  |
Derivative financial instruments |  | 1,814 | 11,978 |
Level 2 of fair value hierarchy [member] | Derivatives [member] |  |  |  |
Assets |  |  |  |
Derivative financial instruments |  | 19,929 | 9,173 |
Level 2 of fair value hierarchy [member] | Other receivables [member] |  |  |  |
Assets |  |  |  |
Other receivables |  |  | 52 |
Level 2 of fair value hierarchy [member] | Other receivables (non-Financial) [member] |  |  |  |
Assets |  |  |  |
Other receivables |  |  |  |
Level 2 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 2 of fair value hierarchy [member] | Certificates of Deposits [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 2 of fair value hierarchy [member] | Commercial Papers [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 2 of fair value hierarchy [member] | Other notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 2 of fair value hierarchy [member] | Bonds and other fixed income [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 9,512 | 19,159 |
Other investments - non-current |  |  |  |
Level 2 of fair value hierarchy [member] | U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 2 of fair value hierarchy [member] | Non - U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 9,512 |  |
Level 2 of fair value hierarchy [member] | Corporates securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 2 of fair value hierarchy [member] | Structured Notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  | 19,159 |
Level 2 of fair value hierarchy [member] | Other investments [member] |  |  |  |
Assets |  |  |  |
Other investments - non-current |  |  |  |
Level 3 of fair value hierarchy [member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Other investments - current |  |  |  |
Other investments - non-current |  | 6,922 | 4,326 |
Current trade receivables |  |  |  |
Other receivables | [2] | 48,659 | 48,659 |
Total |  | 55,581 | 52,985 |
Liabilities |  |  |  |
Borrowings C and NC |  |  |  |
Trade payables |  |  |  |
Finance Lease Liabilities C and NC |  |  |  |
Total |  |  |  |
Level 3 of fair value hierarchy [member] | Derivative liabilities [member] |  |  |  |
Liabilities |  |  |  |
Derivative financial instruments |  |  |  |
Level 3 of fair value hierarchy [member] | Derivatives [member] |  |  |  |
Assets |  |  |  |
Derivative financial instruments |  |  |  |
Level 3 of fair value hierarchy [member] | Other receivables [member] |  |  |  |
Assets |  |  |  |
Other receivables |  | 48,659 | 48,659 |
Level 3 of fair value hierarchy [member] | Other receivables (non-Financial) [member] |  |  |  |
Assets |  |  |  |
Other receivables |  |  |  |
Level 3 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 3 of fair value hierarchy [member] | Certificates of Deposits [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 3 of fair value hierarchy [member] | Commercial Papers [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 3 of fair value hierarchy [member] | Other notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 3 of fair value hierarchy [member] | Bonds and other fixed income [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Other investments - non-current |  |  |  |
Level 3 of fair value hierarchy [member] | U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 3 of fair value hierarchy [member] | Non - U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 3 of fair value hierarchy [member] | Corporates securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 3 of fair value hierarchy [member] | Structured Notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Level 3 of fair value hierarchy [member] | Other investments [member] |  |  |  |
Assets |  |  |  |
Other investments - non-current |  | 6,922 | 4,326 |
Financial assets at amortised cost, category [member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  | 387,602 | 268,163 |
Other investments - current |  | 65,874 | 300,410 |
Other investments - non-current |  |  |  |
Current trade receivables |  | 1,348,160 | 1,737,366 |
Other receivables | [2] | 93,239 | 139,474 |
Total |  | 1,894,875 | 2,445,413 |
Liabilities |  |  |  |
Borrowings C and NC |  | 822,152 | 539,007 |
Trade payables |  | 555,887 | 693,673 |
Finance Lease Liabilities C and NC |  | 230,167 |  |
Total |  | 1,608,206 | 1,232,680 |
Financial assets at amortised cost, category [member] | Derivative liabilities [member] |  |  |  |
Liabilities |  |  |  |
Derivative financial instruments |  |  |  |
Financial assets at amortised cost, category [member] | Derivatives [member] |  |  |  |
Assets |  |  |  |
Derivative financial instruments |  |  |  |
Financial assets at amortised cost, category [member] | Other receivables [member] |  |  |  |
Assets |  |  |  |
Other receivables |  | 93,239 | 139,474 |
Financial assets at amortised cost, category [member] | Other receivables (non-Financial) [member] |  |  |  |
Assets |  |  |  |
Other receivables |  |  |  |
Financial assets at amortised cost, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 65,874 | 300,410 |
Financial assets at amortised cost, category [member] | Certificates of Deposits [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 20,637 | 198,912 |
Financial assets at amortised cost, category [member] | Commercial Papers [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 4,993 | 9,932 |
Financial assets at amortised cost, category [member] | Other notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 40,244 | 91,566 |
Financial assets at amortised cost, category [member] | Bonds and other fixed income [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Other investments - non-current |  |  |  |
Financial assets at amortised cost, category [member] | U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at amortised cost, category [member] | Non - U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at amortised cost, category [member] | Corporates securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at amortised cost, category [member] | Structured Notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at amortised cost, category [member] | Other investments [member] |  |  |  |
Assets |  |  |  |
Other investments - non-current |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Other investments - current |  | 144,502 | 166,094 |
Other investments - non-current |  | 18,012 | 113,830 |
Current trade receivables |  |  |  |
Other receivables | [2] | 48,659 | 48,711 |
Total |  | 211,173 | 328,635 |
Liabilities |  |  |  |
Borrowings C and NC |  |  |  |
Trade payables |  |  |  |
Finance Lease Liabilities C and NC |  |  |  |
Total |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Derivative liabilities [member] |  |  |  |
Liabilities |  |  |  |
Derivative financial instruments |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Derivatives [member] |  |  |  |
Assets |  |  |  |
Derivative financial instruments |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Other receivables [member] |  |  |  |
Assets |  |  |  |
Other receivables |  | 48,659 | 48,711 |
Financial assets at fair value through other comprehensive income, category [member] | Other receivables (non-Financial) [member] |  |  |  |
Assets |  |  |  |
Other receivables |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Certificates of Deposits [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Commercial Papers [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Other notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Bonds and other fixed income [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 144,502 | 166,094 |
Other investments - non-current |  | 18,012 | 113,830 |
Financial assets at fair value through other comprehensive income, category [member] | U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 10,211 | 1,077 |
Financial assets at fair value through other comprehensive income, category [member] | Non - U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 28,637 | 24,912 |
Financial assets at fair value through other comprehensive income, category [member] | Corporates securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  | 105,654 | 140,105 |
Financial assets at fair value through other comprehensive income, category [member] | Structured Notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Other investments [member] |  |  |  |
Assets |  |  |  |
Other investments - non-current |  |  |  |
Financial assets at fair value through profit or loss, category [member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  | 1,166,697 | 160,198 |
Other investments - current |  |  | 21,230 |
Other investments - non-current |  | 6,922 | 4,326 |
Current trade receivables |  |  |  |
Other receivables | [2] |  |  |
Total |  | 1,193,548 | 194,927 |
Liabilities |  |  |  |
Borrowings C and NC |  |  |  |
Trade payables |  |  |  |
Finance Lease Liabilities C and NC |  |  |  |
Total |  | 1,814 | 11,978 |
Financial assets at fair value through profit or loss, category [member] | Derivative liabilities [member] |  |  |  |
Liabilities |  |  |  |
Derivative financial instruments |  | 1,814 | 11,978 |
Financial assets at fair value through profit or loss, category [member] | Derivatives [member] |  |  |  |
Assets |  |  |  |
Derivative financial instruments |  | 19,929 | 9,173 |
Financial assets at fair value through profit or loss, category [member] | Other receivables [member] |  |  |  |
Assets |  |  |  |
Other receivables |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Other receivables (non-Financial) [member] |  |  |  |
Assets |  |  |  |
Other receivables |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Certificates of Deposits [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Commercial Papers [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Other notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Bonds and other fixed income [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  | 21,230 |
Other investments - non-current |  |  |  |
Financial assets at fair value through profit or loss, category [member] | U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Non - U.S. government securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Corporates securities [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  | 2,071 |
Financial assets at fair value through profit or loss, category [member] | Structured Notes [member] |  |  |  |
Assets |  |  |  |
Other investments - current |  |  | 19,159 |
Financial assets at fair value through profit or loss, category [member] | Other investments [member] |  |  |  |
Assets |  |  |  |
Other investments - non-current |  | $ 6,922 | $ 4,326 |
[1] | In 2018 includes $52 thousand of non-current derivatives.
[2] | Includes balances related to interest in our Venezuelan companies. See Note 33.

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