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Pension and Other Postretirement Employee Benefits
 6 Months Ended
Jun. 30, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Pension and Other Postretirement Employee Benefits
PENSION 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):
 
Quarters Ended June 30,
 
Pension
 
OPEB
(Dollars in thousands)
2015
 
2014
 
2015
 
2014
Service cost
$
1,531

 
$
1,339

 
$
4

 
$
(11
)
Interest cost
4,259

 
4,783

 
345

 
372

Expected return on plan assets
(5,192
)
 
(6,126
)
 
—

 
—

Amortization of prior service cost (credit)
152

 
187

 
(2,328
)
 
(2,410
)
Amortization of actuarial loss
4,408

 
3,606

 
466

 
414

Net periodic cost (benefit)
$
5,158

 
$
3,789

 
$
(1,513
)
 
$
(1,635
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
Pension
 
OPEB
(Dollars in thousands)
2015
 
2014
 
2015
 
2014
Service cost
$
3,061

 
$
2,540

 
$
11

 
$
12

Interest cost
8,518

 
9,592

 
728

 
871

Expected return on plan assets
(10,383
)
 
(12,256
)
 
—

 
—

Amortization of prior service cost (credit)
303

 
374

 
(4,656
)
 
(4,820
)
Amortization of actuarial loss
8,816

 
7,226

 
1,024

 
1,093

Net periodic cost (benefit)
$
10,315

 
$
7,476

 
$
(2,893
)
 
$
(2,844
)

During the six months ended June 30, 2015, we paid non-qualified supplemental pension benefits of $0.9 million.

The following tables detail the changes in accumulated other comprehensive loss (AOCL):
 
Quarter Ended June 30, 2015
(Dollars in thousands)
Pension
 
OPEB
 
Total
AOCL at April 1
 
 
 
 
$
116,691

Amortization of defined benefit items, net of tax:1
 
 
 
 
 
Prior service credit (cost)
$
(92
)
 
$
1,420

 
1,328

Actuarial loss
(2,689
)
 
(285
)
 
(2,974
)
Total reclassification for the period
$
(2,781
)
 
$
1,135

 
(1,646
)
AOCL at June 30
 
 
 
 
$
115,045

 
 
 
 
 
 
 
Quarter Ended June 30, 2014
(Dollars in thousands)
Pension
 
OPEB
 
Total
AOCL at April 1
 
 
 
 
$
97,454

Amortization of defined benefit items, net of tax:1
 
 
 
 
 
Prior service credit (cost)
$
(114
)
 
$
1,470

 
1,356

Actuarial loss
(2,200
)
 
(252
)
 
(2,452
)
Total reclassification for the period
$
(2,314
)
 
$
1,218

 
(1,096
)
AOCL at June 30
 
 
 
 
$
96,358

 
 
 
 
 
 
 
Six Months Ended June 30, 2015
(Dollars in thousands)
Pension
 
OPEB
 
Total
AOCL at January 1
 
 
 
 
$
118,392

Amortization of defined benefit items, net of tax:1
 
 
 
 
 
Prior service credit (cost)
$
(184
)
 
$
2,840

 
2,656

Actuarial loss
(5,378
)
 
(625
)
 
(6,003
)
Total reclassification for the period
$
(5,562
)
 
$
2,215

 
(3,347
)
AOCL at June 30
 
 
 
 
$
115,045

 
 
 
 
 
 
 
Six Months Ended June 30, 2014
(Dollars in thousands)
Pension
 
OPEB
 
Total
AOCL at January 1
 
 
 
 
$
98,720

Amortization of defined benefit items, net of tax:1
 
 
 
 
 
Prior service credit (cost)
$
(228
)
 
$
2,940

 
2,712

Actuarial loss
(4,408
)
 
(666
)
 
(5,074
)
Total reclassification for the period
$
(4,636
)
 
$
2,274

 
(2,362
)
AOCL at June 30
 
 
 
 
$
96,358

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