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Asset Retirement Obligation (Tables)

3 Months Ended

Mar. 31, 2014

Changes to Company's Asset Retirement Obligations

 The following table describes the changes to the Company’s asset retirement obligations during the three months ended March 31, 2014 and 2013 (in thousands):

		Three Months Ended March 31,
		2014				2013
Balance at beginning of year		$	4,837			$	4,422
Liabilities incurred			91				71
Liabilities settled			(11	)			(13	)
Accretion expense			42				41
Asset retirement obligation at end of period		$	4,959			$	4,521

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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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 5

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

+ Details

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Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration