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ASSET RETIREMENT OBLIGATION
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
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


ARO reflects the estimated present value of the amount of dismantlement, removal, site reclamation and similar activities associated with the Company’s infrastructure assets which include central processing facilities, gathering systems and pipelines. Management utilizes independent valuation reports and estimates of current costs to project expected cash outflows for retirement obligations. Management estimates the ultimate productive life of the properties, a risk-adjusted discount rate, and an inflation factor in order to determine the current present value of this obligation. To the extent future revisions to these assumptions impact the present value of existing ARO, a corresponding adjustment is made to the property, plant and equipment balance.