Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2017

Asset Retirement Obligation Disclosure [Abstract]

Activity Related to Asset Retirement Obligations

Activity related to the Company’s asset retirement obligations is as follows:

(In thousands)	Nine Months Ended   September 30, 2017
Balance at beginning of period	$	133,733
Liabilities incurred	3,788
Liabilities settled	(1,225		)
Liabilities divested	(75,014		)
Accretion expense	4,396
Balance at end of period	$	65,678