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INVESTMENTS IN NON-CONSOLIDATED COMPANIES INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Summarized balance sheet information) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets [abstract] |  |  |  |  |  |  |
Non-current assets | $ 7,727,283 |  | $ 5,622,556 |  |  |  |
Current assets | 4,395,283 |  | 2,700,314 |  |  |  |
Other current investments | 132,736 |  | 144,853 |  |  |  |
Cash and cash equivalents | 337,779 | [1] | 183,463 | [1] | $ 151,491 | [1] | $ 213,303
Total Assets | 12,122,566 |  | 8,322,870 |  |  |  |
LIABILITIES |  |  |  |  |  |  |
Non-current liabilities | 3,442,521 |  | 1,324,785 |  |  |  |
Non-current borrowings | 1,716,337 |  | 396,742 |  |  |  |
Current liabilities | 2,827,274 |  | 1,831,492 |  |  |  |
Current borrowings | 1,505,570 |  | 821,893 |  |  |  |
Liabilities | 6,269,795 |  | 3,156,277 |  |  |  |
Non-controlling interest | 842,347 |  | 775,295 |  |  |  |
Total Equity | 5,852,771 |  | 5,166,593 |  | $ 4,802,997 |  | $ 5,634,703
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |
Assets [abstract] |  |  |  |  |  |  |
Non-current assets | 5,662,000 |  | 6,086,000 |  |  |  |
Current assets | 1,494,000 |  | 1,277,000 |  |  |  |
Other current investments | 164,000 |  | 472,000 |  |  |  |
Cash and cash equivalents | 535,000 |  | 221,000 |  |  |  |
Total Assets | 7,855,000 |  | 8,056,000 |  |  |  |
LIABILITIES |  |  |  |  |  |  |
Non-current liabilities | 637,000 |  | 753,000 |  |  |  |
Non-current borrowings | 1,707,000 |  | 2,104,000 |  |  |  |
Current liabilities | 622,000 |  | 517,000 |  |  |  |
Current borrowings | 299,000 |  | 21,000 |  |  |  |
Liabilities | 3,265,000 |  | 3,395,000 |  |  |  |
Non-controlling interest | 426,000 |  | 508,000 |  |  |  |
Total Equity | $ 4,164,086 |  | $ 4,153,000 |  |  |  |
[1] | It includes restricted cash of USD 50, USD 83 and USD 88 as of December 31, 2017, 2016 and 2015, respectively. In addition, the Company had other investments with a maturity of more than three months for USD 135,864, USD 150,851 and USD 237,191 as of December 31, 2017, 2016 and 2015, respectively.

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