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Asset Retirement Obligations (ARO) (Tables)

12 Months Ended

Dec. 31, 2011

Asset Retirement Obligations (ARO) [Abstract]

Schedule of Change in Asset Retirement Obligations

The reconciliation of the changes in the asset retirement obligations is presented below:

		Year ended December 31,
		2011				2010
Beginning balance, ARO liability		$	14,274			$	15,233
Additional ARO liability incurred			1,110				1,057
ARO liabilities settled			(1,315	)			(1,162	)
Accretion expense			1,102				1,040
Adjustments (1)			-				(1,894	)
Ending balance, ARO liability		$	15,171			$	14,274

(1) We adjusted our ARO liability in 2010 for changes in the estimated amounts and timing of costs associated with the disposal of spent pot liner.

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- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

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

-Topic 410

-SubTopic 30

-Publisher FASB

-Number

-Article

-Subparagraph

-Name Accounting Standards Codification

-Paragraph 5

-Section 50

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859

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