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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
ASSET RETIREMENT OBLIGATIONS
The ARO liability reflects the present value of estimated costs of dismantlement, removal, site reclamation, and similar activities associated with the Partnership’s working-interest oil and natural gas properties. The Partnership utilizes current retirement costs to estimate the expected cash outflows for retirement obligations. The Partnership estimates the ultimate productive life of the properties, a credit-adjusted risk-free 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 the existing ARO liability, a corresponding adjustment is made to the oil and natural gas property balance.
The following table describes changes to the Partnership’s ARO liability for the periods presented:
 
 
For the year ended December 31,
 
2017
 
2016
 
(in thousands)
Beginning asset retirement obligations
$
13,350

 
$
10,585

Liabilities incurred
308

 
2,009

Liabilities settled
(228
)
 
(317
)
Accretion expense
1,026

 
892

Revisions in estimated costs
83

 
181

Dispositions
(30
)
 
—

Ending asset retirement obligations
$
14,509

 
$
13,350

Current asset retirement obligations
$
417

 
$
—

Non-current asset retirement obligations
$
14,092

 
$
13,350