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Pension and Other Postretirement Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of Net Periodic Cost (Benefit)
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
)
Schedule of Accumulated Other Comprehensive Loss
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).