Asset Retirement Obligations

6 Months Ended

Jun. 30, 2013

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation Disclosure

ASSET RETIREMENT OBLIGATIONS

The following table presents the changes in carrying amounts of the asset retirement obligations associated with our working interest in crude oil and natural gas properties:

	Amount
	(in thousands)
Balance at December 31, 2012	$	62,563
Obligations incurred with development activities	211
Accretion expense	2,481
Revisions in estimated cash flows	963
Obligations discharged with disposal of properties and asset retirements	(7,481		)
Balance at June 30, 2013	58,737
Liabilities held for sale (1)	(22,370		)
Less current portion	(1,000		)
Long-term portion	$	35,367

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(1) Represents asset retirement obligations related to our assets held for sale. See Note 12, Assets Held for Sale, Divestitures and Discontinued Operations, for additional information regarding the planned sale of these properties.