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ASSET RETIREMENT OBLIGATIONS (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2014
$
94,060

Liabilities incurred
981

Liabilities settled
(686
)
Accretion expense
7,108

Reclassification associated with held for sale properties*
(11,473
)
Balance as of December 31, 2015
89,990

Liabilities incurred
230

Liabilities settled
(758
)
Accretion expense
6,672

Revisions in estimated cash flows
(12,875
)
Reclassification associated with held for sale properties**
(1,715
)
Balance as of December 31, 2016
81,544

Liabilities incurred
1,354

Liabilities settled
(351
)
Accretion expense
5,831

Balance as of December 31, 2017
$
88,378


*Asset retirement obligation associated with certain San Juan Basin properties related to assets held for sale.
**Adjustment to the reclassification of the asset retirement obligation associated with a series of asset sales of certain non-core Permian Basin Assets in the Delaware Basin in Texas and in the San Juan Basin in New Mexico.