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Postretirement benefits other than pensions (Tables) (Other Postretirement Benefit Plans, Defined Benefit)
 12 Months Ended
Dec. 28, 2014
Other Postretirement Benefit Plans, Defined Benefit
  
Defined Benefit Plan Disclosure [Line Items]  
Benefit Costs
Postretirement benefit cost for health care and life insurance included the following components:
In thousands of dollars
 
2014
2013
2012
Service cost – benefits earned during the period
$
369

$
529

$
545

Interest cost on net benefit obligation
4,711

5,656

7,744

Amortization of prior service credit
(11,648
)
(9,165
)
(19,190
)
Amortization of actuarial loss
758

1,169

1,943

Net periodic postretirement benefit credit
$
(5,810
)
$
(1,811
)
$
(8,958
)
Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Company-Sponsored Benefit Plans
The table below provides a reconciliation of benefit obligations and funded status of our postretirement benefit plans:
In thousands of dollars
 
Dec. 28, 2014
Dec. 29, 2013
Change in benefit obligations
 
 
Net benefit obligations at beginning of year
$
146,809

$
169,592

Service cost
369

529

Interest cost
4,711

5,656

Plan participants’ contributions
5,133

9,629

Plan amendments
(37,986
)
(496
)
Actuarial loss (gain)
6,954

(16,476
)
Gross benefits paid
(18,739
)
(28,022
)
Federal subsidy on benefits paid
683

4,169

Acquisitions
—

2,228

Net benefit obligations at end of year
$
107,934

$
146,809

Change in plan assets
 
 
Fair value of plan assets at beginning of year
$
—

$
—

Employer contributions
13,606

18,393

Plan participants’ contributions
5,133

9,629

Gross benefits paid
(18,739
)
(28,022
)
Fair value of plan assets at end of year
$
—

$
—

Benefit obligation at end of year
$
(107,934
)
$
(146,809
)
Amounts recognized in Consolidated Balance Sheets
Accrued benefit cost—current
$
(10,286
)
$
(17,731
)
Accrued benefit cost—noncurrent
$
(97,648
)
$
(129,078
)
Schedule of Net Periodic Benefit Cost Not yet Recognized
The following table summarizes the amounts recorded in accumulated other comprehensive income (loss) that have not yet been recognized as a component of net periodic postretirement benefit credit as of the dates presented (pre-tax):
In thousands of dollars
 
 
 
Dec. 28, 2014
Dec. 29, 2013
Net actuarial losses
$
(12,594
)
$
(6,087
)
Prior service credit
42,542

16,204

Amounts in accumulated other comprehensive income (loss)
$
29,948

$
10,117
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Loss) Income
Other changes in plan assets and benefit obligations recognized in other comprehensive (loss) consist of the following:
In thousands of dollars
 
2014
Current year actuarial loss
$
(7,265
)
Change in prior service cost
37,986

Amortization of actuarial loss
758

Amortization of prior service credit
(11,648
)
Total
$
19,831
Assumptions Used to Determine Defined Benefit Plans Costs
Postretirement benefit costs: The following assumptions were used to determine postretirement benefit cost:
 
2014
2013
2012
Discount rate
4.50
%
3.80
%
4.75
%
Health care cost trend rate assumed for next year
6.26
%
7.17
%
6.50
%
Ultimate trend rate
5.00
%
5.00
%
5.00
%
Year that ultimate trend rate is reached
2018

2017

2016
Health Care Cost Trend Rates Assumptions Disclosure
Benefit obligations and funded status: The following assumptions were used to determine the year-end benefit obligation:
 
Dec. 28, 2014
Dec. 29, 2013
Discount rate
4.00
%
4.75
%
Health care cost trend rate assumed for
next year
6.26
%
7.17
%
Ultimate trend rate
5.00
%
5.00
%
Year that ultimate trend rate is reached
2018

2017
Estimated Benefit Payments
Cash flows: We expect to make the following benefit payments, which reflect expected future service, and to receive the following federal subsidy benefits as appropriate:
In thousands of dollars
Benefit
Payments
2015
$
10,287

2016
$
9,109

2017
$
8,502

2018
$
8,578

2019
$
7,970

2020-2023
$
32,087