PENSION PLANS AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS

The following tables detail the components of net periodic cost (benefit) of our pension plans and other postretirement employee benefits (OPEB) for the quarters and six months ended June 30:

Quarters ended June 30:



	Pension Plans						Other Postretirement Employee Benefits
(Dollars in thousands)	2013			2012			2013			2012
Service cost	$	1,246		$	1,337		$	23		$	19
Interest cost	4,458			5,012			447			488
Expected return on plan assets	(6,522		)	(7,205		)	—			—
Amortization of prior service cost (credit)	195			192			(2,427		)	(2,496		)
Amortization of actuarial loss	5,021			3,975			790			582
Net periodic cost (benefit)	$	4,398		$	3,311		$	(1,167	)	$	(1,407	)

Six months ended June 30:



	Pension Plans						Other Postretirement Employee Benefits
(Dollars in thousands)	2013			2012			2013			2012
Service cost	$	2,659		$	2,619		$	46		$	142
Interest cost	8,912			9,993			905			1,239
Expected return on plan assets	(13,046		)	(14,378		)	—			—
Amortization of prior service cost (credit)	390			385			(4,854		)	(4,775		)
Amortization of actuarial loss	9,965			7,678			1,605			1,564
Net periodic cost (benefit)	$	8,880		$	6,297		$	(2,298	)	$	(1,830	)

During the six months ended June 30, 2013, we made contributions of $0.9 million to our non-qualified supplemental pension plan.

The following tables detail the changes in accumulated other comprehensive loss (AOCL) by component for the quarters and six months ended June 30:

Quarters ended June 30:



	2013
(Dollars in thousands)	Pension Plans		Other Postretirement Employee Benefits			Total
AOCL at April 1						$	138,747
Amortization of defined benefit items, net of tax^(a)
Prior service cost (credit)	$	119	$	(1,480	)	(1,361		)
Actuarial loss	3,063		481			3,544
Total reclassification for the period	$	3,182	$	(999	)	2,183
AOCL at June 30						$	136,564

	2012
(Dollars in thousands)	Pension Plans		Other Postretirement Employee Benefits			Total
AOCL at April 1						$	139,297
Amortization of defined benefit items, net of tax^(a)
Prior service cost (credit)	$	117	$	(1,522	)	(1,405		)
Actuarial loss	2,425		355			2,780
Total reclassification for the period	$	2,542	$	(1,167	)	1,375
AOCL at June 30						$	137,922

Six months ended June 30:



	2013
(Dollars in thousands)	Pension Plans		Other Postretirement Employee Benefits			Total
AOCL at January 1						$	140,898
Amortization of defined benefit items, net of tax^(a)
Prior service cost (credit)	$	238	$	(2,961	)	(2,723		)
Actuarial loss	6,078		979			7,057
Total reclassification for the period	$	6,316	$	(1,982	)	4,334
AOCL at June 30						$	136,564

	2012
(Dollars in thousands)	Pension Plans		Other Postretirement Employee Benefits			Total
AOCL at January 1						$	140,882
Amortization of defined benefit items, net of tax^(a)
Prior service cost (credit)	$	235	$	(2,913	)	(2,678		)
Actuarial loss	4,684		954			5,638
Total reclassification for the period	$	4,919	$	(1,959	)	2,960
AOCL at June 30						$	137,922

^(a) Amortization of prior service cost (credit) and amortization of actuarial loss are included in the computation of net periodic cost.