v2.3.0.15

ASSET RETIREMENT OBLIGATION (Tables)

9 Months Ended

Sep. 30, 2011

ASSET RETIREMENT OBLIGATION

Schedule of changes to asset retirement obligations

		Three months ended						Nine months ended
		September 30, 2011			September 30, 2010			September 30, 2011			September 30, 2010
Asset retirement obligation—beginning of period		$	9,860		$	8,981		$	9,478		$	8,619
Changes in estimated obligations			(287	)		—			(287	)		10
Accretion of discount			184			176			566			528
Total asset retirement obligation—end of period		$	9,757		$	9,157		$	9,757		$	9,157

X

- Details

Name:	us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

+ Details

Name:	us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix:	us-gaap
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration