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Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2018
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 nine months ended September 30, 2018:
 
(In thousands)
Balance at December 31, 2017
$
48,799

Liabilities incurred during period
5,509

Liabilities settled during period
(4,904
)
Accretion expense during period(1)
1,975

Revisions to estimates
83

Balance at September 30, 2018
$
51,462

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