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ASSET RETIREMENT OBLIGATION (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:
 
 
December 31,
 
 
2018
 
2017
 
 
(In thousands)
Asset retirement obligation, beginning balance
 
$
18,189

 
$
—

Liabilities incurred during the period
 
13,816

 
17,779

Accretion expense
 
1,328

 
410

Revisions in estimated liabilities
 
(3,964
)
 
—

Asset retirement obligation, ending balance
 
$
29,369

 
$
18,189