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Asset Retirement Obligation
 6 Months Ended
Jun. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Asset Retirement Obligation
The following table describes the changes to the Company’s asset retirement obligation liability (in thousands):
 
Six Months Ended June 30,
 
2015
 
2014
Asset retirement obligation, beginning of period
$
54,970

 
$
48,536

Liabilities incurred
397

 
224

Liabilities settled
(1,186
)
 
(1,149
)
Accretion expense
1,682

 
1,499

Revisions in estimates
554

 
742

Divestiture of oil and gas properties
(1,794
)
 
—

Asset retirement obligation, end of period
54,623

 
49,852

Less: current portion of asset retirement obligation
(1,405
)
 
(2,959
)
Long-term asset retirement obligation
$
53,218

 
$
46,893