XML 120 R82.htm IDEA: XBRL DOCUMENT v3.19.1

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.

X

- References

No definition available.

+ Details

Name:	ifrs-full_AssetsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash balances held at banks.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_BalancesWithBanks
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph B13
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_a&doctype=Appendix&seq=2
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 54
-Subparagraph i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_i&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_CashAndCashEquivalents
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of current investments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_CurrentInvestments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of current trade receivables. [Refer: Trade receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 68
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_68&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_CurrentTradeReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_DerivativeFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_DerivativeFinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 35H
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35H&doctype=Standard
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 35I
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35I&doctype=Standard
-URIDate 2017-03-09

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 35M
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard
-URIDate 2017-03-09

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 35N
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35N&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_FinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_FinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_LiabilitiesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of non-current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Non-current financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 8
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_NoncurrentFinancialAssetsAvailableforsale
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of non-current investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method; Non-current assets; Investments other than investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Current liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_OtherCurrentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of liabilities that the entity does not separately disclose in the same statement or note.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_OtherLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount receivable by the entity that it does not separately disclose in the same statement or note.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_OtherReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_ShorttermDepositsClassifiedAsCashEquivalents
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of current trade payables and current other payables. [Refer: Current trade payables; Other current payables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 54
-Subparagraph k
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_k&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_TradeAndOtherCurrentPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfLiabilitiesAxis=ts_DerivativeLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfLiabilitiesAxis=ts_ForeignExchangeDerivativesContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfLiabilitiesAxis=ts_OtherLiabilitiesNonfinancialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=ifrs-full_DerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=ts_OtherReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=ts_OtherReceivablesNonfinancialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentAxis=ts_FixedIncomeTimedepositZeroCouponBondsCommercialPapersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentSecuritiesClassAxis=ts_CertificatesOfDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentSecuritiesClassAxis=ts_CommercialPapersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentSecuritiesClassAxis=ts_OtherNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentAxis=ts_BondsAndOtherFixedIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentSecuritiesClassAxis=ts_UsGovernmentSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentSecuritiesClassAxis=ts_NonUsGovernmentSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentSecuritiesClassAxis=ts_CorporatesSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentSecuritiesClassAxis=ts_StructuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentSecuritiesClassAxis=ts_MortgageAndAssetbackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	invest_InvestmentAxis=ts_OtherInvestments1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level1OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_LoansAndReceivablesCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_HeldtomaturityInvestmentsCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAvailableforsaleCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: