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Pension and Other Postretirement Employee Benefits
 9 Months Ended
Sep. 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):
 
Quarter Ended September 30,
 
Pension
 
OPEB
(Dollars in thousands)
2015
 
2014
 
2015
 
2014
Service cost
$
1,559

 
$
1,270

 
$
5

 
$
7

Interest cost
4,241

 
4,796

 
364

 
435

Expected return on plan assets
(5,220
)
 
(6,128
)
 
—

 
—

Amortization of prior service cost (credit)
151

 
187

 
(2,328
)
 
(2,411
)
Amortization of actuarial loss
4,636

 
3,613

 
512

 
546

Net periodic cost (benefit)
$
5,367

 
$
3,738

 
$
(1,447
)
 
$
(1,423
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
Pension
 
OPEB
(Dollars in thousands)
2015
 
2014
 
2015
 
2014
Service cost
$
4,620

 
$
3,810

 
$
16

 
$
19

Interest cost
12,759

 
14,388

 
1,092

 
1,306

Expected return on plan assets
(15,603
)
 
(18,384
)
 
—

 
—

Amortization of prior service cost (credit)
454

 
561

 
(6,984
)
 
(7,231
)
Amortization of actuarial loss
13,452

 
10,839

 
1,536

 
1,639

Net periodic cost (benefit)
$
15,682

 
$
11,214

 
$
(4,340
)
 
$
(4,267
)

During the nine months ended September 30, 2015, we paid non-qualified supplemental pension benefits of $1.4 million.

The following tables detail the changes in accumulated other comprehensive loss (AOCL):
 
Quarter Ended September 30, 2015
(Dollars in thousands)
Pension
 
OPEB
 
Total
AOCL at July 1
 
 
 
 
$
115,045

Amortization of defined benefit items, net of tax:1
 
 
 
 
 
Prior service credit (cost)
$
(93
)
 
$
1,420

 
1,327

Actuarial loss
(2,828
)
 
(311
)
 
(3,139
)
Total reclassification for the period
$
(2,921
)
 
$
1,109

 
(1,812
)
AOCL at September 30
 
 
 
 
$
113,233

 
 
 
 
 
 
 
Quarter Ended September 30, 2014
(Dollars in thousands)
Pension
 
OPEB
 
Total
AOCL at July 1
 
 
 
 
$
96,358

Amortization of defined benefit items, net of tax:1
 
 
 
 
 
Prior service credit (cost)
$
(114
)
 
$
1,471

 
1,357

Actuarial loss
(2,204
)
 
(334
)
 
(2,538
)
Total reclassification for the period
$
(2,318
)
 
$
1,137

 
(1,181
)
AOCL at September 30
 
 
 
 
$
95,177

 
 
 
 
 
 
 
Nine Months Ended September 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)
$
(277
)
 
$
4,260

 
3,983

Actuarial loss
(8,206
)
 
(936
)
 
(9,142
)
Total reclassification for the period
$
(8,483
)
 
$
3,324

 
(5,159
)
AOCL at September 30
 
 
 
 
$
113,233

 
 
 
 
 
 
 
Nine Months Ended September 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)
$
(342
)
 
$
4,411

 
4,069

Actuarial loss
(6,612
)
 
(1,000
)
 
(7,612
)
Total reclassification for the period
$
(6,954
)
 
$
3,411

 
(3,543
)
AOCL at September 30
 
 
 
 
$
95,177

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