Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations

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Asset Retirement Obligations
9 Months Ended
Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
 
The change in asset retirement obligations for the nine months ended September 30, 2018 is set forth below (in thousands):
Asset retirement obligations, beginning of period
$
8,630

Additional liabilities incurred
4,367

Dispositions

Accretion expense
442

Liabilities settled upon plugging and abandoning wells
(551
)
Revision of estimates
207

Asset retirement obligations, end of period
13,095

Less: current portion of asset retirement obligations
(58
)
Long-term asset retirement obligations
$
13,037