Annual report pursuant to Section 13 and 15(d)

SEGMENT REPORTING SEGMENT REPORTING (Revenue from External Customers by Products and Services) (Details)

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12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 91.00% 91.00% 92.00%
Freight and Venture Partners' Cost Reimbursements [Member]      
Revenue from External Customer [Line Items]      
Concentration Risk, Percentage 9.00% 9.00% 8.00%