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Pension and Other Postretirement Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
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):

 

 

Three Months Ended March 31,

 

 

 

Pension

 

 

OPEB

 

(Dollars in thousands)

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Service cost

 

$

1,913

 

 

$

1,862

 

 

$

44

 

 

$

3

 

Interest cost

 

 

3,914

 

 

 

4,081

 

 

 

319

 

 

 

321

 

Expected return on plan assets

 

 

(4,708

)

 

 

(4,603

)

 

 

—

 

 

 

—

 

Amortization of prior service cost (credit)

 

 

46

 

 

 

72

 

 

 

(2,219

)

 

 

(2,219

)

Amortization of actuarial loss

 

 

4,150

 

 

 

3,856

 

 

 

355

 

 

 

398

 

Net periodic cost (benefit)

 

$

5,315

 

 

$

5,268

 

 

$

(1,501

)

 

$

(1,497

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
Schedule of Pension and OPEB Changes in Accumulated Other Comprehensive Loss

The following tables detail the pension and OPEB changes in accumulated other comprehensive loss on our Condensed Consolidated Balance Sheets, net of tax:

 

 

Three Months Ended March 31, 2018

 

(Dollars in thousands)

 

Pension

 

 

OPEB

 

 

Total

 

Balance at December 31, 2017

 

$

100,611

 

 

$

(5,055

)

 

$

95,556

 

Amortization of defined benefit items, net of tax:1

 

 

 

 

 

 

 

 

 

 

 

 

Prior service credit (cost)

 

 

(34

)

 

 

1,642

 

 

 

1,608

 

Actuarial loss

 

 

(3,071

)

 

 

(262

)

 

 

(3,333

)

Total reclassification for the period

 

 

(3,105

)

 

 

1,380

 

 

 

(1,725

)

Amounts reclassified from AOCL

 

 

23,787

 

 

 

(372

)

 

 

23,415

 

Balance at March 31, 2018

 

$

121,293

 

 

$

(4,047

)

 

$

117,246

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended March 31, 2017

 

(Dollars in thousands)

 

Pension

 

 

OPEB

 

 

Total

 

Balance at December 31, 2016

 

$

120,627

 

 

$

(9,182

)

 

$

111,445

 

Amortization of defined benefit items, net of tax:1

 

 

 

 

 

 

 

 

 

 

 

 

Prior service credit (cost)

 

 

(44

)

 

 

1,354

 

 

 

1,310

 

Actuarial loss

 

 

(2,352

)

 

 

(243

)

 

 

(2,595

)

Total reclassification for the period

 

 

(2,396

)

 

 

1,111

 

 

 

(1,285

)

Balance at March 1, 2017

 

$

118,231

 

 

$

(8,071

)

 

$

110,160

 

1

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