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