Asset Retirement Obligations

6 Months Ended

Jun. 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)	Six Months Ended   June 30, 2015
Balance at beginning of period	$	126,655
Liabilities incurred	6,969
Liabilities settled	(203		)
Accretion expense	3,342
Balance at end of period	$	136,763

As of both June 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.