Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2016

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Periodic Benefit Costs

The components of net periodic benefit cost for Energen’s defined benefit non-contributory pension plan and certain nonqualified supplemental pension plans were as follows:

	Three months ended September 30,				Nine months ended September 30,
(in thousands)	2016		2015		2016		2015
Components of net periodic benefit cost:
Interest cost	$	—	$	204	—		612
Actuarial loss	—		184		—		553
Settlement charge	—		546		3,325		3,909
Net periodic expense	$	—	$	934	$	3,325	$	5,074

Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Periodic Benefit Costs

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

	Three months ended September 30,						Nine months ended September 30,
(in thousands)	2016			2015			2016			2015
Components of net periodic benefit cost:
Service cost	$	24		$	98		$	71		$	294
Interest cost	52			117			170			350
Expected long-term return on assets	(68		)	(114		)	(248		)	(343		)
Prior service cost amortization	(113		)	—			(351		)	—
Settlement charge	—			—			45			—
Curtailment gain	—			—			(816		)	—
Net periodic (income) expense	$	(105	)	$	101		$	(1,129	)	$	301