Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2017

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation

A reconciliation of our liability for plugging and abandonment costs for the nine months ended September 30, 2017 is as follows (in thousands):

	Nine Months Ended September 30,  2017
Beginning of period	$	257,943
Liabilities incurred		5,597
Liabilities settled		(6,125	)
Disposition of wells		(2,427	)
Accretion expense		11,022
Change in estimate		862
End of period		266,872
Less current portion		(7,271	)
Long-term asset retirement obligations	$	259,601