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Asset Retirement Obligations (Tables)
3 Months Ended
Mar. 31, 2017
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, 2017:
 
(In thousands)
Balance at December 31, 2016
$
49,687

Liabilities incurred during period
351

Liabilities settled during period
(89
)
Accretion expense during period(1)
655

Revisions to estimates
(215
)
Balance at March 31, 2017
$
50,389

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