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RELATED PARTY TRANSACTIONS (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Key management personnel compensation	$ 23,031	$ 12,461
Key management personnel compensation, shares	828
Key management personnel compensation, share-based payment	$ 2,069	$ 1,818
Techint Holdings S.à.r.l | Entities with joint control or significant influence over entity
Disclosure of transactions between related parties [line items]
Percentage of Company shares owned	0.6202
Tenaris Investments S.à.r.l. | Entities with joint control or significant influence over entity
Disclosure of transactions between related parties [line items]
Percentage of Company shares owned	0.1146

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

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Key management personnel compensation, shares

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