Segment Reporting (Schedule Of Concentrations In Revenue) (Details)

v2.4.0.6

Segment Reporting (Schedule Of Concentrations In Revenue) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Percentage of Total Revenue	100.00%	100.00%	100.00%
Iron Ore [Member]
Percentage of Total Revenue	85.00%	81.00%	81.00%
Coal [Member]
Percentage of Total Revenue	11.00%	13.00%	14.00%
Reimbursement Revenue And Freight Revenue [Member]
Percentage of Total Revenue	4.00%	6.00%	5.00%