Employee Benefit Plans (Tables)

6 Months Ended

Jun. 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 June 30,					Six months ended June 30,
(in thousands)	2015		2014			2015		2014
Components of net periodic benefit cost:
Service cost	$	—	$	1,621		$	—	$	3,256
Interest cost	204		1,404			408		2,817
Expected long-term return on assets	—		(1,449		)	—		(2,909		)
Actuarial loss	184		1,407			369		2,819
Prior service cost amortization	—		57			—		114
Settlement charge	701		115			3,363		3,673
Net periodic expense	$	1,089	$	3,155		$	4,140	$	9,770

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 June 30,						Six months ended June 30,
(in thousands)	2015			2014			2015			2014
Components of net periodic benefit cost:
Service cost	$	98		$	59		$	196		$	119
Interest cost	117			224			233			450
Expected long-term return on assets	(114		)	(383		)	(229		)	(770		)
Actuarial gain	—			(209		)	—			(421		)
Transition amortization	—			15			—			30
Net periodic (income) expense	$	101		$	(294	)	$	200		$	(592	)