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Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2016
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, 2016:
 
(In thousands)
Balance at December 31, 2015
$
35,812

Liabilities incurred during period
248

Liabilities settled during period(1)
(443
)
Accretion expense during period(2)
940

Revisions to estimates
571

Balance at June 30, 2016
$
37,128

___________________
(1)
Liabilities settled during the six months ended June 30, 2016 included ARO related to the sold properties (see Note 7 – Divestiture).
(2)
Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statement of Operations.