Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2019

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation

A reconciliation of our liability for plugging and abandonment costs for the six months ended June 30, 2019 and the year ended December 31, 2018 is as follows (in thousands):

	Six Months Ended June 30,  2019			Year Ended December 31, 2018
Beginning of period	$	312,754		$	276,855
Liabilities incurred		2,529			3,376
Acquisitions		—			13,438
Liabilities settled		(2,582	)		(5,052	)
Disposition of wells		—			(13,332	)
Accretion expense		8,487			25,456
Change in estimate		(203	)		12,013
End of period		320,985			312,754
Less current portion		(5,485	)		(5,485	)
Long-term asset retirement obligations	$	315,500		$	307,269