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SEGMENT REPORTING SEGMENT REPORTING (Revenue from External Customers by Products and Services) (Details) (Sales Revenue, Net [Member], Product Concentration Risk [Member])
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Revenue from External Customer [Line Items] | |||
| Concentration Risk, Percentage | 100.00% | 100.00% | 100.00% |
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Iron Ore Revenue [Member]
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| Revenue from External Customer [Line Items] | |||
| Concentration Risk, Percentage | 80.00% | 81.00% | 88.00% |
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Coal Revenue [Member]
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| Revenue from External Customer [Line Items] | |||
| Concentration Risk, Percentage | 13.00% | 13.00% | 8.00% |
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Freight and Venture Partners' Cost Reimbursements [Member]
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| Revenue from External Customer [Line Items] | |||
| Concentration Risk, Percentage | 7.00% | 6.00% | 4.00% |
| X | ||||||||||
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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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- Details
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