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Asset Retirement Obligation (Tables)
 9 Months Ended
Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Changes to the Company's asset retirement obligation liability
The following table describes the changes to the Company’s asset retirement obligation liability (in thousands):
 
Nine Months Ended September 30,
 
2016
 
2015
Asset retirement obligation, beginning of period
$
42,556

 
$
54,970

Liabilities incurred
—

 
392

Liabilities settled
(2,943
)
 
(1,826
)
Accretion expense
1,896

 
2,507

Revisions in estimates
291

 
(5,345
)
Divestiture of oil and gas properties
(75
)
 
(2,103
)
Asset retirement obligation, end of period
41,725

 
48,595

Less: current portion of asset retirement obligation
(1,132
)
 
(5,378
)
Long-term asset retirement obligation
$
40,593

 
$
43,217