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Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes in Asset Retirement Obligations
The following table reflects the changes in the Company’s ARO during the six months ended June 30, 2015:
 
(In thousands)
Balance at December 31, 2014
$
42,549

Liabilities incurred during period
1,044

Liabilities settled during period
(14
)
Accretion expense during period(1)
1,088

Revisions to estimates
241

Balance at June 30, 2015
$
44,908

___________________
(1)
Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statement of Operations.