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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Changes in Asset Retirement Obligations
The following table summarizes the changes in the Company’s asset retirement obligations for the nine months ended September 30, 2016 (in thousands):
 
September 30, 2016
Asset retirement obligations, beginning of period
$
18,220

Additional liabilities incurred
1,803

Accretion expense
575

Liabilities settled upon plugging and abandoning wells
(6
)
Disposition of wells
(534
)
Revision of estimates
(2,927
)
Asset retirement obligations, end of period
$
17,131