Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2015

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

The components of net periodic benefit cost from continuing operations 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)	2015		2014			2015		2014
Components of net periodic benefit cost:
Service cost	$	—	$	1,902		$	—	$	5,157
Interest cost	204		1,157			612		3,974
Expected long-term return on assets	—		(1,157		)	—		(4,067		)
Actuarial loss	184		1,296			553		4,115
Prior service cost amortization	—		63			—		177
Settlement charge	546		370			3,909		4,043
Net periodic expense	$	934	$	3,631		$	5,074	$	13,399

Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

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

	Three months ended September 30,						Nine months ended September 30,
(in thousands)	2015			2014			2015			2014
Components of net periodic benefit cost:
Service cost	$	98		$	87		$	294		$	206
Interest cost	117			137			350			587
Expected long-term return on assets	(114		)	(246		)	(343		)	(1,016		)
Actuarial gain	—			(151		)	—			(572		)
Transition amortization	—			9			—			39
Net periodic (income) expense	$	101		$	(164	)	$	301		$	(756	)