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INVESTMENTS IN NON-CONSOLIDATED COMPANIES INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Summarized income statement information) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of unconsolidated structured entities [line items] |  |  |
Net sales | $ 9,700,296 | $ 7,223,975 | $ 7,877,449
Cost of sales | (7,403,025) | (5,384,390) | (6,477,272)
Gross profit | 2,297,271 | 1,839,585 | 1,400,177
Selling, general and administrative expenses | (824,247) | (687,942) | (770,292)
Other operating (expenses) income, net | (16,240) | (9,925) | 9,454
Profit (loss) from operating activities | 1,456,784 | 1,141,718 | 639,339
Finance expense | (114,583) | (89,971) | (89,489)
Profit before income tax expense | 1,359,809 | 1,118,457 | 267,099
Income tax expense | (336,882) | (411,528) | (207,320)
Net profit (loss) before non-controlling interest | 1,022,927 | 706,929 | 59,779
Non-controlling interest in other subsidiaries | (136,708) | (111,285) | (51,652)
Net profit (loss) for the year | 886,219 | 595,644 | $ 8,127
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Net sales | 3,368,000 | 2,443,000 |
Cost of sales | (2,854,000) | (2,292,000) |
Gross profit | 514,000 | 151,000 |
Selling, general and administrative expenses | (206,000) | (180,000) |
Other operating (expenses) income, net | (78,000) | (61,000) |
Profit (loss) from operating activities | 230,000 | (90,000) |
Finance expense | (145,000) | (17,000) |
Equity in earnings of associated companies | 49,000 | 40,000 |
Profit before income tax expense | 134,000 | (67,000) |
Income tax expense | (34,000) | (99,000) |
Net profit (loss) before non-controlling interest | 100,000 | (166,000) |
Non-controlling interest in other subsidiaries | (26,000) | (28,000) |
Net profit (loss) for the year | $ 74,000 | $ (194,000) |

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_103&doctype=Standard -URIDate 2017-03-09 + Details
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