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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
The following table reflects the components of the change in Energen’s ARO balance:

(in thousands)
 
Balance as of December 31, 2011
$
107,340

Liabilities incurred
3,994

Liabilities settled
(845
)
Accretion expense (including discontinued operations of $1,195)
7,534

Balance as of December 31, 2012
118,023

Liabilities incurred
2,772

Liabilities settled
(5,525
)
Accretion expense (including discontinued operations of $1,197)
8,192

Reclassification associated with held for sale properties*
(14,929
)
Balance as of December 31, 2013
108,533

Liabilities incurred
2,266

Liabilities settled
(1,543
)
Accretion expense (including discontinued operations of $251)
7,859

Revision in estimated cash flows
692

Reclassification associated with held for sale properties**
(23,747
)
Balance as of December 31, 2014
$
94,060


*Asset retirement obligation associated with North Louisiana/East Texas properties are included as liabilities related to assets held for sale in current liabilities on the balance sheet.
**Asset retirement obligation associated with certain San Juan Basin properties are included as liabilities related to assets held for sale in current liabilities on the balance sheet.