Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2018

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, 2018 is as follows (in thousands):

	Six Months Ended June 30,  2018
Beginning of period	$	276,855
Liabilities incurred		2,050
Acquisitions		13,438
Liabilities settled		(2,080	)
Accretion expense		8,210
Change in estimate		4,073
End of period		302,546
Less current portion		(6,327	)
Long-term asset retirement obligations	$	296,219