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Financial Risk Management - Financial Instruments and Classification Within the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Cash and cash equivalents |  | $ 428,361 |  |  | $ 330,221 |
Other investments - current |  | 487,734 |  |  | 1,192,306 |
Derivative financial instruments |  | 9,225 |  |  | 8,230 |
Other investments - non-current |  | 118,155 |  |  | 128,335 |
Trade receivables |  | 1,737,366 |  | $ 1,214,060 | 1,214,060 |
Other receivables |  | 307,790 | [1] |  | 327,258 |
Total |  |  |  |  |  |
Cash at banks |  | 81,211 |  |  | 150,948 |
Liquidity funds |  | 160,198 |  |  | 66,033 |
Short – term investments |  | 186,952 |  |  | 113,240 |
Current trade receivables |  | 1,737,366 |  | 1,214,060 | 1,214,060 |
Non-current financial assets available-for-sale |  |  |  |  | 21,572 | $ 21,600
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  | 539,007 |  |  | 965,859 |
Trade payables |  | 693,673 |  |  | 750,739 |
Derivative financial instruments |  | 11,978 |  |  | 39,799 |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |
Other liabilities |  |  |  |  | 197,504 |
Other liabilities current |  | 165,693 |  |  | 157,705 |
Derivative liabilities [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Derivative financial instruments |  | 11,978 |  |  |  |
Foreign exchange derivatives contracts [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  | 39,799 |
Other liabilities (non-Financial) [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  | 157,705 |
Derivatives [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Derivative financial instruments |  | 9,173 |  |  |  |
Other receivables |  |  |  |  | 8,230 |
Other receivables [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  | 188,185 |  |  | 176,716 |
Other receivables (non-Financial) [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  | 119,605 |  |  | 142,312 |
Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 300,410 |  |  | 437,406 |
Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 198,912 |  |  | 297,788 |
Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 9,932 |  |  | 9,943 |
Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Other notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 91,566 |  |  | 129,675 |
Bonds and other fixed income [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 187,324 |  |  | 754,800 |
Other investments - non-current |  | 113,829 |  |  | 123,498 |
Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 1,077 |  |  | 130,477 |
Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 24,912 |  |  | 161,063 |
Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 142,176 |  |  | 378,831 |
Bonds and other fixed income [member] | Structured Notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 19,159 |  |  | 68,044 |
Bonds and other fixed income [member] | Mortgage- and Asset-backed securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 16,385 |
Other investments [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 100 |
Other investments - non-current |  | 4,326 |  |  | 4,837 |
Level 1 of fair value hierarchy [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents |  | 160,198 |  |  | 179,273 |
Other investments - current |  | 168,165 |  |  | 459,476 |
Other investments - non-current |  | 113,830 |  |  |  |
Trade receivables |  |  |  |  |  |
Other receivables |  |  | [1] |  |  |
Total |  | 442,193 |  |  | 638,749 |
Cash at banks |  |  |  |  |  |
Liquidity funds |  |  |  |  | 66,033 |
Short – term investments |  |  |  |  | 113,240 |
Current trade receivables |  |  |  |  |  |
Non-current financial assets available-for-sale | [1] |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 442,193 |  |  | 638,749 |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  |  |  |  |  |
Trade payables |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |
Other liabilities |  |  |  |  |  |
Level 1 of fair value hierarchy [member] | Derivative liabilities [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Level 1 of fair value hierarchy [member] | Foreign exchange derivatives contracts [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Level 1 of fair value hierarchy [member] | Other liabilities (non-Financial) [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Level 1 of fair value hierarchy [member] | Derivatives [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Other receivables |  |  |  |  |  |
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 |  |  |  |  | 9,943 |
Level 1 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 1 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 9,943 |
Level 1 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [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 |  | 168,165 |  |  | 449,533 |
Other investments - non-current |  | 113,830 |  |  |  |
Level 1 of fair value hierarchy [member] | Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 1,077 |  |  | 130,477 |
Level 1 of fair value hierarchy [member] | Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 24,912 |  |  | 124,780 |
Level 1 of fair value hierarchy [member] | Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 142,176 |  |  | 194,276 |
Level 1 of fair value hierarchy [member] | Bonds and other fixed income [member] | Structured Notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 1 of fair value hierarchy [member] | Bonds and other fixed income [member] | Mortgage- and Asset-backed securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 1 of fair value hierarchy [member] | Other investments [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  |  |  |  |  |
Level 2 of fair value hierarchy [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |
Other investments - current |  | 19,159 |  |  | 511,992 |
Other investments - non-current |  |  |  |  |  |
Trade receivables |  |  |  |  |  |
Other receivables |  | 52 | [1] |  | 8,230 |
Total |  | 28,384 |  |  | 520,222 |
Cash at banks |  |  |  |  |  |
Liquidity funds |  |  |  |  |  |
Short – term investments |  |  |  |  |  |
Current trade receivables |  |  |  |  |  |
Non-current financial assets available-for-sale | [1] |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 28,384 |  |  | 520,222 |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  |  |  |  |  |
Trade payables |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 11,978 |  |  | 39,799 |
Other liabilities |  |  |  |  | 39,799 |
Level 2 of fair value hierarchy [member] | Derivative liabilities [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Derivative financial instruments |  | 11,978 |  |  |  |
Level 2 of fair value hierarchy [member] | Foreign exchange derivatives contracts [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  | 39,799 |
Level 2 of fair value hierarchy [member] | Other liabilities (non-Financial) [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Level 2 of fair value hierarchy [member] | Derivatives [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Derivative financial instruments |  | 9,173 |  |  |  |
Other receivables |  |  |  |  | 8,230 |
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 |  |  |  |  | 427,463 |
Level 2 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 297,788 |
Level 2 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 2 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Other notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 129,675 |
Level 2 of fair value hierarchy [member] | Bonds and other fixed income [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 19,159 |  |  | 84,429 |
Other investments - non-current |  |  |  |  |  |
Level 2 of fair value hierarchy [member] | Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 2 of fair value hierarchy [member] | Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 2 of fair value hierarchy [member] | Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 2 of fair value hierarchy [member] | Bonds and other fixed income [member] | Structured Notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 19,159 |  |  | 68,044 |
Level 2 of fair value hierarchy [member] | Bonds and other fixed income [member] | Mortgage- and Asset-backed securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 16,385 |
Level 2 of fair value hierarchy [member] | Other investments [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 100 |
Other investments - non-current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  | 4,326 |  |  | 4,837 |
Trade receivables |  |  |  |  |  |
Other receivables |  | 48,659 | [1] |  |  |
Total |  | 52,985 |  |  | 26,409 |
Cash at banks |  |  |  |  |  |
Liquidity funds |  |  |  |  |  |
Short – term investments |  |  |  |  |  |
Current trade receivables |  |  |  |  |  |
Non-current financial assets available-for-sale | [1] |  |  |  | 21,572 |
Closing balance December 31, 2017 - IAS 39 |  | 52,985 |  |  | 26,409 |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  |  |  |  |  |
Trade payables |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |
Other liabilities |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Derivative liabilities [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Foreign exchange derivatives contracts [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Other liabilities (non-Financial) [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Derivatives [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Other receivables [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  | 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] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [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] | Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Bonds and other fixed income [member] | Structured Notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Bonds and other fixed income [member] | Mortgage- and Asset-backed securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Level 3 of fair value hierarchy [member] | Other investments [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  | 4,326 |  |  | 4,837 |
Financial assets at amortised cost, category [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents |  | 268,163 |  |  |  |
Other investments - current |  | 300,410 |  |  |  |
Other investments - non-current |  |  |  |  |  |
Trade receivables |  | 1,737,366 |  |  |  |
Other receivables | [1] | 139,474 |  |  |  |
Total |  | 2,445,413 |  | 2,092,370 |  |
Current trade receivables |  | 1,737,366 |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 2,445,413 |  | 2,092,370 |  |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  | 539,007 |  |  |  |
Trade payables |  | 693,673 |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 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 |  | 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 |  | 300,410 |  |  |  |
Financial assets at amortised cost, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 198,912 |  |  |  |
Financial assets at amortised cost, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 9,932 |  |  |  |
Financial assets at amortised cost, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Other notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 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] | Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets at amortised cost, category [member] | Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets at amortised cost, category [member] | Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets at amortised cost, category [member] | Bonds and other fixed income [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 |  | 166,094 |  |  |  |
Other investments - non-current |  | 113,830 |  |  |  |
Trade receivables |  |  |  |  |  |
Other receivables | [1] | 48,711 |  |  |  |
Total |  | 328,635 |  | 519,610 |  |
Current trade receivables |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 328,635 |  | 519,610 |  |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  |  |  |  |  |
Trade payables |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |
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 |  | 48,711 |  |  |  |
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] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [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 |  | 166,094 |  |  |  |
Other investments - non-current |  | 113,830 |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 1,077 |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 24,912 |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 140,105 |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | Bonds and other fixed income [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 |  | 160,198 |  |  | 179,273 |
Other investments - current |  | 21,230 |  |  | 971,468 |
Other investments - non-current |  | 4,326 |  |  | 4,837 |
Trade receivables |  |  |  |  |  |
Other receivables |  |  | [1] |  | 8,230 |
Total |  | 194,927 |  | 459,460 | 1,163,808 |
Cash at banks |  |  |  |  |  |
Liquidity funds |  |  |  |  | 66,033 |
Short – term investments |  |  |  |  | 113,240 |
Current trade receivables |  |  |  |  |  |
Non-current financial assets available-for-sale | [1] |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 194,927 |  | 459,460 | 1,163,808 |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  |  |  |  |  |
Trade payables |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 11,978 |  |  | 39,799 |
Other liabilities |  |  |  |  | 39,799 |
Financial assets at fair value through profit or loss, category [member] | Derivative liabilities [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Derivative financial instruments |  | 11,978 |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Foreign exchange derivatives contracts [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  | 39,799 |
Financial assets at fair value through profit or loss, category [member] | Other liabilities (non-Financial) [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Derivatives [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Derivative financial instruments |  | 9,173 |  |  |  |
Other receivables |  |  |  |  | 8,230 |
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 |  |  |  |  | 437,406 |
Financial assets at fair value through profit or loss, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 297,788 |
Financial assets at fair value through profit or loss, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 9,943 |
Financial assets at fair value through profit or loss, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Other notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 129,675 |
Financial assets at fair value through profit or loss, category [member] | Bonds and other fixed income [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 21,230 |  |  | 533,962 |
Other investments - non-current |  |  |  |  |  |
Financial assets at fair value through profit or loss, category [member] | Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 130,477 |
Financial assets at fair value through profit or loss, category [member] | Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 124,780 |
Financial assets at fair value through profit or loss, category [member] | Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 2,071 |  |  | 194,276 |
Financial assets at fair value through profit or loss, category [member] | Bonds and other fixed income [member] | Structured Notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  | 19,159 |  |  | 68,044 |
Financial assets at fair value through profit or loss, category [member] | Bonds and other fixed income [member] | Mortgage- and Asset-backed securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 16,385 |
Financial assets at fair value through profit or loss, category [member] | Other investments [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 100 |
Other investments - non-current |  | $ 4,326 |  |  | 4,837 |
Loans and receivables, category [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 150,948 |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  |  |  |  |  |
Trade receivables |  |  |  |  | 1,214,060 |
Other receivables |  |  |  |  | 176,716 |
Total |  |  |  |  | 1,541,724 |
Cash at banks |  |  |  |  | 150,948 |
Liquidity funds |  |  |  |  |  |
Short – term investments |  |  |  |  |  |
Current trade receivables |  |  |  |  | 1,214,060 |
Non-current financial assets available-for-sale | [1] |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  | 1,541,724 |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  |  |  |  | 965,859 |
Trade payables |  |  |  |  | 750,739 |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  | 1,716,598 |
Other liabilities |  |  |  |  |  |
Loans and receivables, category [member] | Foreign exchange derivatives contracts [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Loans and receivables, category [member] | Other liabilities (non-Financial) [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Loans and receivables, category [member] | Derivatives [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Loans and receivables, category [member] | Other receivables [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  |  |  |  | 176,716 |
Loans and receivables, category [member] | Other receivables (non-Financial) [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Loans and receivables, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Loans and receivables, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Loans and receivables, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Loans and receivables, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Other notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Loans and receivables, category [member] | Bonds and other fixed income [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  |  |  |  |  |
Loans and receivables, category [member] | Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Loans and receivables, category [member] | Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Loans and receivables, category [member] | Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Loans and receivables, category [member] | Bonds and other fixed income [member] | Structured Notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Loans and receivables, category [member] | Bonds and other fixed income [member] | Mortgage- and Asset-backed securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Loans and receivables, category [member] | Other investments [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  |  |  |  |  |
Held-to-maturity investments, category [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |
Other investments - current |  |  |  |  | 220,838 |
Other investments - non-current |  |  |  |  | 123,498 |
Trade receivables |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Total |  |  |  |  | 344,336 |
Cash at banks |  |  |  |  |  |
Liquidity funds |  |  |  |  |  |
Short – term investments |  |  |  |  |  |
Current trade receivables |  |  |  |  |  |
Non-current financial assets available-for-sale | [1] |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  | 344,336 |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  |  |  |  |  |
Trade payables |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |
Other liabilities |  |  |  |  |  |
Held-to-maturity investments, category [member] | Foreign exchange derivatives contracts [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Held-to-maturity investments, category [member] | Other liabilities (non-Financial) [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Held-to-maturity investments, category [member] | Derivatives [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Held-to-maturity investments, category [member] | Other receivables [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Held-to-maturity investments, category [member] | Other receivables (non-Financial) [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Held-to-maturity investments, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Held-to-maturity investments, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Held-to-maturity investments, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Held-to-maturity investments, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Other notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Held-to-maturity investments, category [member] | Bonds and other fixed income [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 220,838 |
Other investments - non-current |  |  |  |  | 123,498 |
Held-to-maturity investments, category [member] | Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Held-to-maturity investments, category [member] | Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 36,283 |
Held-to-maturity investments, category [member] | Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  | 184,555 |
Held-to-maturity investments, category [member] | Bonds and other fixed income [member] | Structured Notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Held-to-maturity investments, category [member] | Bonds and other fixed income [member] | Mortgage- and Asset-backed securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Held-to-maturity investments, category [member] | Other investments [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  |  |  |  |  |
Financial assets available-for-sale, category [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  |  |  |  |  |
Trade receivables |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Total |  |  |  |  | 21,572 |
Cash at banks |  |  |  |  |  |
Liquidity funds |  |  |  |  |  |
Short – term investments |  |  |  |  |  |
Current trade receivables |  |  |  |  |  |
Non-current financial assets available-for-sale | [1] |  |  |  | 21,572 |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  | 21,572 |
Liabilities |  |  |  |  |  |
Borrowings C and NC |  |  |  |  |  |
Trade payables |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |
Other liabilities |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Foreign exchange derivatives contracts [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Other liabilities (non-Financial) [member] |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Other liabilities current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Derivatives [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Other receivables [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Other receivables (non-Financial) [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other receivables |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Certificates of Deposits [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Commercial Papers [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Fixed Income (time-deposit, zero coupon bonds, commercial papers) [member] | Other notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Bonds and other fixed income [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Bonds and other fixed income [member] | U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Bonds and other fixed income [member] | Non - U.S. government securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Bonds and other fixed income [member] | Corporates securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Bonds and other fixed income [member] | Structured Notes [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Bonds and other fixed income [member] | Mortgage- and Asset-backed securities [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Financial assets available-for-sale, category [member] | Other investments [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Other investments - current |  |  |  |  |  |
Other investments - non-current |  |  |  |  |  |
[1] | Includes balances related to interest in our Venezuelan companies, see Note 30.

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