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Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2019
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, 2019:
 (In thousands)
Balance at December 31, 2018$52,449  
Liabilities incurred during period1,436  
Liabilities settled during period(644) 
Accretion expense during period(1)
2,187  
Revisions to estimates647  
Balance at September 30, 2019$56,075  
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(1)Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statements of Operations.