Asset Retirement Obligations

9 Months Ended

Sep. 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	337
Accretion expense	3,667
Revisions in estimated cash flows	251
Obligations discharged with divestitures of properties and asset retirements	(7,376		)
Balance at September 30, 2013	59,442
Less: Liabilities held for sale (1)	22,788
Less: Current portion	1,000
Long-term portion	$	35,654

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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 and Note 15, Subsequent Events, for additional information regarding the potential sale of these properties.