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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.