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Investments (Amounts Recognized In Consolidated Statements Of Operations Related To Notes Receivable) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest income on FMG Note	$ 214,455	$ 149,257	$ 66,079
Amortization expense on prepaid mining interest	54,429	53,228	53,692
Fortescue [Member]
Interest income on FMG Note	214,455	149,257	66,079
Interest accreted on zero-coupon note component	4,533	4,030	3,582
Amortization expense on prepaid mining interest	$ 11,800	$ 9,943	$ 7,293

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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