Asset Retirement Obligation

6 Months Ended

Jun. 30, 2013

Asset Retirement Obligation Disclosure [Abstract]

The following table describes the changes to the Company’s asset retirement obligation liability (in thousands):



	Six Months Ended June 30,
	2013			2012
Asset retirement obligation, beginning of period	$	27,260		$	30,427
Liabilities incurred	498			840
Liabilities settled	(94		)	(2,450		)
Accretion expense	660			1,017
Revisions in estimated cash flows	986			(42		)
Asset retirement obligation, end of period	29,310			29,792
Less: current portion of asset retirement obligation	(3,823		)	(1,034		)
Long-term asset retirement obligation	$	25,487		$	28,758

- 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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