| Component: (Network and Table) | |
|---|---|
| Network | 2414402 - Disclosure - ASSET RETIREMENT OBLIGATIONS - Components of Changes in ARO (Details) (http://www.energen.com/role/AssetRetirementObligationsComponentsOfChangesInAroDetails)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0000277595 (http://www.sec.gov/CIK) | 
| Asset Retirement Obligation Disclosure [Abstract] | Period [Axis] | ||
|---|---|---|---|
2016-01-01 - 2016-12-31  | 2015-01-01 - 2015-12-31  | 2014-01-01 - 2014-12-31  | |
Asset Retirement Obligation Disclosure [Abstract]  | |||
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  | |||
Balance of ARO, beginning  | |||
Liabilities incurred  | |||
Liabilities settled  | (  | (  | (  | 
Accretion expense  | |||
Revision in estimated cash flows  | (  | (  | |
Reclassification associated with held for sale properties  | (  | (  | (  | 
Balance of ARO, end  | 89,990,000    | 94,060,000    | |
Accretion expense of discontinued operations  | |||