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Asset Retirement Obligations

9 Months Ended

Sep. 30, 2012

Asset Retirement Obligations [Abstract]

(4) Asset Retirement Obligations

Changes in our asset retirement obligations were as follows:


	Nine Months Ended
	September 30, 2012
	(in thousands)
Balance at December 31, 2011	$	99,347
Accretion expense		10,031
Liabilities assumed in acquisition		1,878
Liabilities incurred		121
Revisions		11,410
Liabilities settled		(27,647)
Balance at September 30, 2012		95,140
Less: End of period, current portion		24,496
End of period, noncurrent portion	$	70,644

- Definition

The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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