Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2017

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 June 30,						Six months ended June 30,
(in thousands)	2017			2016			2017			2016
Components of net periodic benefit cost:
Service cost	$	18		$	24		$	35		$	47
Interest cost	57			52			113			118
Expected long-term return on assets	(62		)	(69		)	(124		)	(180		)
Prior service cost amortization	(114		)	(113		)	(227		)	(238		)
Actuarial loss amortization	2			—			5			—
Settlement charge	—			—			—			45
Curtailment gain	—			—			—			(816		)
Net periodic income	$	(99	)	$	(106	)	$	(198	)	$	(1,024	)