Asset Retirement Obligation

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation

(6) ASSET RETIREMENT OBLIGATION

We recognize the present value of asset retirement obligations beginning in the period in which they are incurred if a reasonable estimate of a fair value can be made. The associated asset retirement costs are capitalized as part of the carrying amount of the long-lived asset. A summary of our asset retirement obligations as of December 31, 2014 is as follows (in thousands):

	Asset Retirement
Asset Category	Obligation			Estimated Life
Oil and gas producing properties	$	2	(1)	27.5 years

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(1) This is a recurring Level 3 fair value measurement.

The following table describes all changes to our asset retirement obligation liability during the years ended December 31, 2014 and 2013 (in thousands):

	2014		2013
Asset retirement obligation at beginning of period	$	2	$	4
Additions during the period		—		1
Revisions of estimates		—		(3	)
Accretion expense		—		—
Asset retirement obligation at end of period	$	2	$	2