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SEGMENT REPORTING (Schedule of Concentrations in Revenue) (Details) (Sales Revenue, Net [Member])
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12 Months Ended | ||||||||||||
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Dec. 31, 2012
Customer Concentration Risk [Member]
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Dec. 31, 2012
Product Concentration Risk [Member]
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Dec. 31, 2011
Product Concentration Risk [Member]
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Dec. 31, 2010
Product Concentration Risk [Member]
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Dec. 31, 2012
Product Concentration Risk [Member]
Iron Ore Revenue [Member]
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Dec. 31, 2011
Product Concentration Risk [Member]
Iron Ore Revenue [Member]
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Dec. 31, 2010
Product Concentration Risk [Member]
Iron Ore Revenue [Member]
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Dec. 31, 2012
Product Concentration Risk [Member]
Coal Revenue [Member]
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Dec. 31, 2011
Product Concentration Risk [Member]
Coal Revenue [Member]
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Dec. 31, 2010
Product Concentration Risk [Member]
Coal Revenue [Member]
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Dec. 31, 2012
Product Concentration Risk [Member]
Freight and Venture Partners' Cost Reimbursements [Member]
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Dec. 31, 2011
Product Concentration Risk [Member]
Freight and Venture Partners' Cost Reimbursements [Member]
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Dec. 31, 2010
Product Concentration Risk [Member]
Freight and Venture Partners' Cost Reimbursements [Member]
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| Segment Reporting Information [Line Items] | |||||||||||||
| Entity-Wide Revenue, Major Customer, Percentage | 10.00% | ||||||||||||
| Percentage of total revenue contributed by each category of products and services | 100.00% | 100.00% | 100.00% | 81.00% | 88.00% | 84.00% | 13.00% | 8.00% | 9.00% | 6.00% | 4.00% | 7.00% |
| X | ||||||||||
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- Definition
Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. No definition available.
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| X | ||||||||||
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- Definition
The percentage of net product revenue to total net revenue from the sale of goods as of year end. No definition available.
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| X | ||||||||||
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- Details
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