Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

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,
(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	)

	Six months ended June 30,
(in thousands)	2018			2017			Line item where presented
Components of net periodic benefit cost:
Service cost	$	32		$	35		General and administrative
Interest cost	107			113			Interest expense
Expected long-term return on assets	(101		)	(124		)	Other income
Prior service cost amortization	(227		)	(227		)	Other income
Actuarial loss amortization	62			5			Other income
Net periodic income	$	(127	)	$	(198	)