This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References+ Details

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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+ Details

Quarterly Results (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Dec. 31, 2010 Minerals and Materials [Member]	Sep. 30, 2010 Minerals and Materials [Member]	Dec. 31, 2010 CEO [Member]	Sep. 30, 2011 Belgian joint venture [Member]
Segment Reporting Information [Line Items]
Segment recorded expenses			$ 2,779	$ 2,982
Expenses associated with retirement of CEO					2,665
Loss from sale of joint venture and affiliated entities						2,104
Quarterly Results (Textual) [Abstract]
Recovery of mining costs	1,464
Income (loss) from affiliates and joint ventures		11,705
Tax expenses associated with foreign jurisdictions		$ 1,300