Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2014

Asset Retirement Obligation Disclosure [Abstract]

Schedule of changes in asset retirement obligations

The following table reflects the changes in ARO during the three months ended March 31, 2014 and the year ended December 31, 2013:

	March 31, 2014			December 31, 2013
	(In thousands)
Beginning of period	$	49,981		$	51,477
Additional ARO from new properties	242			795
Sales or abandonments of properties	(3,153		)	(5,892		)
Accretion expense	886			4,203
Revisions of previous estimates	(143		)	(602		)
End of period	$	47,813		$	49,981