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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes in Asset Retirement Obligations
The following table reflects the changes in the Company’s ARO during the years ended December 31, 2015 and 2014:

 
Year Ended December 31,
 
2015
 
2014
 
(In thousands)
Asset retirement obligation — beginning of period
$
42,549

 
$
36,458

Liabilities incurred during period
1,245

 
5,376

Liabilities settled during period(1)
(218
)
 
(2,065
)
Accretion expense during period(2)
2,223

 
1,917

Revisions to estimates
241

 
863

Liabilities held for sale(3)
(10,228
)
 
—

Asset retirement obligation — end of period
$
35,812

 
$
42,549


__________________ 
(1)
Liabilities settled during the year ended December 31, 2014 include ARO related to the properties sold in the Sanish Divestiture.
(2)
Included in depreciation, depletion and amortization on the Company’s Consolidated Statement of Operations.
(3)
Represents ARO related to the properties held for sale as of December 31, 2015 (see Note 7 — Assets Held for Sale).