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ASSET RETIREMENT OBLIGATION (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes in Asset Retirement Obligation
The following table describes changes to the Company’s asset retirement obligation (ARO) liability for the years ended December 31, 2019 and 2018:
 
 
December 31,
 
 
2019
 
2018
 
 
 
 
 
 
 
(In thousands)
Asset retirement obligation, beginning balance
 
$
29,369

 
$
18,189

Liabilities incurred during the period
 
15,303

 
13,816

Accretion expense
 
1,639

 
1,328

Revisions in estimated liabilities
 
13,784

 
(3,964
)
Asset retirement obligation, ending balance
 
$
60,095

 
$
29,369