SEGMENT REPORTING (Revenue from External Customers by Products and Services) (Details) - Sales Revenue, Net [Member] - Product Concentration Risk [Member] |
12 Months Ended | ||
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Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Revenue from External Customer [Line Items] | |||
| Concentration Risk, Percentage | 100.00% | 100.00% | 100.00% |
| Iron Ore Revenue [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Concentration Risk, Percentage | 90.00% | 91.00% | 91.00% |
| Freight and Venture Partners' Cost Reimbursements [Member] | |||
| Revenue from External Customer [Line Items] | |||
| Concentration Risk, Percentage | 10.00% | 9.00% | 9.00% |
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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