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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2011

Asset Retirement Obligations [Abstract]

Schedule Of Changes In Asset Retirement Obligations

			September 30,				September 30,
		December 31,
		2011				2010
		(In thousands)
Asset retirement obligation — beginning of period		$	7,640			$	6,511
Liabilities incurred during period			4,100				1,747
Liabilities settled during period			(369	)			(422	)
Accretion expense during period			590				414
Revisions to estimates			1,114				(610	)
Asset retirement obligation — end of period		$	13,075			$	7,640

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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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