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Investments (Amounts Recognized In Consolidated Statements Of Operations Related To Notes Receivable) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Amortization expense on prepaid mining interest	$ 40,855	$ 18,579	$ 80,351	$ 36,341
Fortescue [Member]
Interest income on FMG Note	71,740	67,103	116,809	104,516
Interest accreted on zero-coupon note component	1,218	1,083	2,436	2,165
Amortization expense on prepaid mining interest	$ 4,047	$ 3,034	$ 6,942	$ 5,150

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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