Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Periodic Benefit Costs

The components of net periodic postretirement benefit income for Energen’s postretirement benefit plan were as follows:

	Three months ended March 31,
(in thousands)	2018			2017			Line item where presented
Components of net periodic benefit cost:
Service cost	$	16		$	18		General and administrative
Interest cost	53			57			Interest expense
Expected long-term return on assets	(51		)	(62		)	Other income
Prior service cost amortization	(113		)	(114		)	Other income
Actuarial loss amortization	31			2			Other income
Net periodic income	$	(64	)	$	(99	)