XML 76 R22.htm IDEA: XBRL DOCUMENT v3.5.0.2
Asset Retirement Obligation (Tables)
 6 Months Ended
Jun. 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):
 
Six Months Ended June 30,
 
2016
 
2015
Asset retirement obligation, beginning of period
$
42,556

 
$
54,970

Liabilities incurred
—

 
397

Liabilities settled
(2,574
)
 
(1,186
)
Accretion expense
1,226

 
1,682

Revisions in estimates
291

 
554

Divestiture of oil and gas properties
(17
)
 
(1,794
)
Asset retirement obligation, end of period
41,482

 
54,623

Less: current portion of asset retirement obligation
(1,496
)
 
(1,405
)
Long-term asset retirement obligation
$
39,986

 
$
53,218