Asset Retirement Obligations

9 Months Ended

Sep. 30, 2015

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)	Nine Months Ended   September 30, 2015
Balance at beginning of period	$	126,655
Liabilities incurred	9,230
Liabilities settled	(83		)
Accretion expense	5,087
Balance at end of period	$	140,889

As of September 30, 2015 and December 31, 2014, approximately $2.0 million is included in accrued liabilities in the Condensed Consolidated Balance Sheet, which represents the current portion of the Company’s asset retirement obligations.