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Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2018:
 
(In thousands)
Balance at December 31, 2017
$
48,799

Liabilities incurred during period
4,008

Liabilities settled during period
(1
)
Accretion expense during period(1)
1,314

Revisions to estimates
84

Liabilities held for sale(2)
(4,167
)
Balance at June 30, 2018
$
50,037

___________________
(1)
Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statements of Operations.
(2)
Represents ARO related to the properties held for sale as of June 30, 2018 (see Note 10 - Divestitures and Assets Held for Sale).