Asset Retirement Obligations

3 Months Ended

Mar. 31, 2017

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

Asset Retirement Obligations

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

(In thousands)	Three Months Ended   March 31, 2017
Balance at beginning of period	$	133,733
Liabilities incurred	702
Liabilities settled	(696		)
Accretion expense	1,787
Balance at end of period	$	135,526