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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Changes to the Company's asset retirement obligation liability
The following table summarizes the changes to the Company’s asset retirement obligation (in thousands):
 
Year Ended December 31,
 
2018
 
2017
Asset retirement obligation, beginning of period
$
31,310

 
$
36,610

Liabilities incurred
7

 
574

Liabilities settled
(863
)
 
(3,364
)
Accretion expense
322

 
2,252

Revisions in estimated cash flows
(62
)
 
(4,514
)
Divestiture of oil and gas properties
(28,234
)
 
(248
)
Asset retirement obligation, end of period
2,480

 
31,310

Less: current portion of asset retirement obligation
(183
)
 
(687
)
Long-term asset retirement obligation
$
2,297

 
$
30,623