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Pension Benefit and Retirement Health and Life Insurance Benefits (Tables)
 12 Months Ended
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Change in benefit obligation
(Dollars in thousands)
Pension Benefits
 
Retirement Health and Life Insurance Benefits
Change in benefit obligation:
2013
2012
 
 
2013
2012
 
 
 
 
 
 
 
 
 
Benefit obligation at beginning of year
$
209,844

$
193,715

 
 
$
11,891

$
10,495

 
Service cost
2,473

4,596

 
 
627

630

 
Interest cost
7,753

8,420

 
 
262

364

 
Actuarial (gain) loss
(15,834
)
16,636

 
 
(1,205
)
(395
)
 
Benefit payments
(7,276
)
(6,800
)
 
 
(751
)
(795
)
 
Settlement charge
—

(6,723
)
 
 
—

—

 
Special termination benefit
(22,635
)
—

 
 
—

1,592

 
Benefit obligation at end of year
$
174,325

$
209,844

 
 
$
10,824

$
11,891

 
Change in plan assets
Change in plan assets:
2013
2012
 
 
2013
2012
 
 
 
 
 
 
 
 
 
Fair value of plan assets at the beginning of the year
$
143,540

$
120,565

 
 
$
—

$
—

 
Actual return on plan assets
21,954

13,775

 
 
—

—

 
Employer contributions
13,000

22,723

 
 
751

795

 
Benefit payments
(7,276
)
(6,800
)
 
 
(751
)
(795
)
 
Settlement charge
—

(6,723
)
 
 
—

—

 
Fair value of plan assets at the end of the year
171,218

143,540

 
 
—

—

 
Funded status
$
(3,107
)
$
(66,304
)
 
 
$
(10,824
)
$
(11,891
)
 
Amounts recognized in consolidated balance sheet
Amounts recognized in the consolidated statements of financial position consist of:
(Dollars in thousands)
Pension Benefits
 
Retirement Health and Life Insurance Benefits
 
2013
2012
 
 
2013
2012
 
Noncurrent assets
$
2,983

$
—

 
 
$
—

$
—

 
Current liabilities
(654
)
(362
)
 
 
(1,175
)
(1,237
)
 
Noncurrent liabilities
(5,436
)
(65,942
)
 
 
(9,649
)
(10,654
)
 
Net amount recognized at end of year
$
(3,107
)
$
(66,304
)
 
 
$
(10,824
)
$
(11,891
)
 
Schedule of net periodic benefit cost not yet recognized
(Dollars in thousands)
Pension Benefits
 
Retirement Health and Life Insurance Benefits
 
2013
 
2013
Net actuarial loss
$
35,119

 
$
1,778

Prior service cost
—

 
—

Net amount recognized at end of year
$
35,119

 
$
1,778
Components of net periodic benefit cost
Components of Net Periodic Benefit Cost
(Dollars in thousands)
Pension Benefits
 
Postretirement Health and Life Insurance Benefits
 
2013
 
2012
 
2011
 
 
2013
 
2012
 
2011
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
2,473

 
$
4,596

 
$
3,922

 
 
$
627

 
$
630

 
$
693

Interest cost
7,753

 
8,420

 
8,535

 
 
262

 
364

 
413

Expected return of plan assets
(11,247
)
 
(9,892
)
 
(10,559
)
 
 
—

 
—

 
—

Amortization of prior service cost
124

 
463

 
597

 
 
(230
)
 
(451
)
 
(627
)
Amortization of net loss
3,615

 
5,471

 
2,331

 
 
204

 
313

 
421

Settlement charge/(credit)
—

 
2,073

 
—

 
 
—

 
—

 
—

Special termination benefit
—

 
—

 
176

 
 
—

 
1,592

 
—

Curtailment charge
1,537

 
—

 
—

 
 
—

 
—

 
—

Net periodic benefit cost
$
4,255

 
$
11,131

 
$
5,002

 
 
$
863

 
$
2,448

 
$
900
Schedule of weighted-average assumptions used
Weighted-average assumptions used to determine benefit obligations at December 31:
 
Pension Benefits
 
Retirement Health and Life Insurance Benefits
 
2013
2012
 
 
2013
2012
 
 
 
 
 
 
 
 
 
Discount rate
4.75
%
4.00
%
 
 
3.25
%
2.50
%
 
Rate of compensation increase
—
%
4.00
%
 
 
—
%
—
%
 
Expected long-term rate of return on plan assets
7.50
%
7.50
%
 
 
—
%
—
%
 
Weighted-average assumptions used to determine net benefit cost for the years ended:
 
Pension Benefits
 
Retirement Health and Life Insurance Benefits
 
2013
2012
 
 
2013
2012
 
 
 
 
 
 
 
 
 
Discount rate
4.00
%
4.50
%
 
 
2.50
%
3.50
%
 
Expected long-term rate of return on plan assets
7.50
%
7.75
%
 
 
—

—

 
Rate of compensation increase
4.00
%
4.00
%
 
 
—

—

 
Schedule of effect of one-percentage-point change in assumed health care cost trend rates
A one-percentage point change in assumed health care cost trend rates would have the following effects:
(Dollars in thousands)
One Percentage Point
 
Increase
 
Decrease
 
 
 
 
Effect on total service and interest cost
$
69

 
$
596

Effect on other postretirement benefit obligations
(64
)
 
(558
)
Schedule of allocation of plan assets
The following table presents the fair value of the net assets by asset category at December 31, 2013 and 2012:
(Dollars in thousands)
2013
 
2012
 
 
 
 
Pooled separate accounts
$
38,584

 
$
29,869

Mutual funds
119,277

 
98,269

Guaranteed deposit account
13,357

 
15,402

Total investments at fair value
$
171,218

 
$
143,540

The following tables set forth by level, within the fair value hierarchy, the assets carried at fair value as of December 31, 2013 and 2012.
 
Assets at Fair Value as of December 31, 2013
(Dollars in thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Pooled separate accounts
$
—

 
$
38,584

 
$
—

 
$
38,584

Mutual funds
119,277

 
—

 
—

 
119,277

Guaranteed deposit account
—

 
—

 
13,357

 
13,357

Total assets at fair value
$
119,277

 
$
38,584

 
$
13,357

 
$
171,218

 
 
 
 
 
 
 
 
 
Assets at Fair Value as of December 31, 2012
(Dollars in thousands)
Level 1
 
Level 2
 
Level 3
 
Total
Pooled separate accounts
$
—

 
$
29,869

 
$
—

 
$
29,869

Mutual funds
98,269

 
—

 
—

 
98,269

Guaranteed deposit account
—

 
—

 
15,402

 
15,402

Total assets at fair value
$
98,269

 
$
29,869

 
$
15,402

 
$
143,540
Changes in fair value of Level 3 assets
The table below sets forth a summary of changes in the fair value of the guaranteed deposit account's Level 3 assets for the year ended December 31, 2013.
(Dollars in thousands)
Guaranteed Deposit Account
 
 
Balance at beginning of year
$
15,402

Realized gains (losses)
—

Unrealized gains relating to instruments still held at the reporting date
784

Purchases, sales, issuances and settlements (net)
(2,829
)
Transfers in and/or out of Level 3
—

Balance at end of year
$
13,357
Schedule of future benefit payments
The following pension benefit payments, which reflect expected future employee service, as appropriate, are expected to be paid through the utilization of plan assets for the funded plans and from operating cash flows for the unfunded plans. The Retiree Health and Life Insurance benefits, for which no funding has been made, are expected to be paid from operating cash flows. The benefit payments are based on the same assumptions used to measure our benefit obligation at the end of fiscal 2013.
 
Pension Benefits
 
Retiree Health and Life Insurance Benefits
 
 
 
 
2014
8,682

 
1,175

2015
8,210

 
1,186

2016
8,302

 
1,170

2017
8,599

 
1,094

2018
8,959

 
1,074

2019-2023
50,843

 
6,234