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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 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 (in thousands):
 
Year Ended December 31,
 
2016
 
2015
Asset retirement obligation, beginning of period
$
42,556

 
$
54,970

Liabilities incurred
—

 
466

Liabilities settled
(3,296
)
 
(2,776
)
Accretion expense
2,515

 
3,259

Revisions in estimated cash flows
(1,746
)
 
(11,137
)
Divestiture of oil and gas properties
(3,419
)
 
(2,226
)
Asset retirement obligation, end of period
36,610

 
42,556

Less: current portion of asset retirement obligation
(4,160
)
 
(6,015
)
Long-term asset retirement obligation
$
32,450

 
$
36,541