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Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2013
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, 2013:
 
 
(In thousands)
Balance at December 31, 2012
$
23,234

Liabilities incurred during period
2,635

Liabilities settled during period
23

Accretion expense during period (1)
581

Revisions to estimates
227

Balance at June 30, 2013
$
26,700

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