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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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