Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2017

Asset Retirement Obligation Disclosure [Abstract]

Changes in Asset Retirement Obligations

As of June 30, 2017, and December 31, 2016, our ARO were reported as “Asset retirement obligations” in our unaudited condensed consolidated balance sheets. Changes in our ARO for the periods indicated are presented in the following table:

	Six Months Ended			Year Ended
	June 30, 2017			December 31, 2016
	(in thousands)
Asset retirement obligations - beginning of period	$	11,331		$	12,679
Liabilities incurred for new wells and interest		636			747
Liabilities settled upon plugging and abandoning wells		(17	)		—
Liabilities removed upon sale of wells		—			(2,827	)
Revision of estimates		(75	)		155
Accretion expense		244			577
Asset retirement obligations - end of period	$	12,119		$	11,331