Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2016

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net 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 March 31,
(in thousands)	2016		2015
Components of net periodic benefit cost:
Interest cost	$	—	$	204
Actuarial loss	—		184
Settlement charge	3,325		2,662
Net periodic expense	$	3,325	$	3,050

Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

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

	Three months ended March 31,
(in thousands)	2016			2015
Components of net periodic benefit cost:
Service cost	$	23		$	98
Interest cost	66			117
Expected long-term return on assets	(111		)	(114		)
Prior service cost amortization	(125		)	—
Settlement charge	45			—
Curtailment gain	(816		)	—
Net periodic (income) expense	$	(918	)	$	101