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Asset Retirement Obligations (Tables)
3 Months Ended
Mar. 31, 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 three months ended March 31, 2015:
 
(In thousands)
Balance at December 31, 2014
$
42,549

Liabilities incurred during period
372

Liabilities settled during period
(41
)
Accretion expense during period(1)
537

Revisions to estimates
241

Balance at March 31, 2015
$
43,658

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