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Postretirement benefits other than pensions (Tables)
 12 Months Ended
Dec. 30, 2012
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

2012
2011
2010
Service cost – benefits earned during the period
$
545

$
611

$
713

Interest cost on net benefit obligation
7,744

9,205

10,606

Amortization of prior service credit
(19,190
)
(19,510
)
(19,377
)
Amortization of actuarial loss
1,943

5,444

4,949

Net periodic postretirement benefit
$
(8,958
)
$
(4,250
)
$
(3,109
)
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
 
2012
Current year actuarial loss
$
(236,163
)
Amortization of actuarial loss
53,429

Amortization of prior service costs
7,689

Actuarial gain due to settlement
7,946

Currency loss
(11,585
)
Total
$
(178,684
)
Other changes in plan assets and benefit obligations recognized in other comprehensive (loss) consist of the following:
In thousands of dollars
 
2012
Current year actuarial gain
$
5,364

Amortization of actuarial loss
1,943

Amortization of prior service credit
(19,190
)
Total
$
(11,883
)
Assumptions Used to Determine Defined Benefit Plans Costs
Postretirement benefit costs: The following assumptions were used to determine postretirement benefit cost:
 
2012
2011
2010
Discount rate
4.75
%
5.30
%
5.80
%
Health care cost trend rate assumed for next year
6.50
%
6.50
%
6.50
%
Ultimate trend rate
5.00
%
5.00
%
5.00
%
Year that ultimate trend rate is reached
2016

2015

2014
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. 30, 2012
Dec. 25, 2011
Discount rate
3.80
%
4.75
%
Health care cost trend rate assumed for
next year
6.50
%
6.50
%
Ultimate trend rate
5.00
%
5.00
%
Year that ultimate trend rate is reached
2016

2015
Estimated Benefit Payments
Cash flows: The company expects 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
Subsidy Benefits
2013
$
19,655

$
4,360

2014
$
19,154

$
3,626

2015
$
18,559

$
3,592

2016
$
17,751

$
3,501

2017
$
16,927

$
3,439

2018-2022
$
69,422

$
15,361
Other Postretirement Benefit Plans, Defined Benefit
  
Defined Benefit Plan Disclosure [Line Items]  
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 the company’s postretirement benefit plans:
In thousands of dollars

Dec. 30, 2012
Dec. 25, 2011
Change in benefit obligations
 
 
Net benefit obligations at beginning of year
$
184,131

$
191,282

Service cost
545

611

Interest cost
7,744

9,205

Plan participants’ contributions
10,362

10,896

Actuarial (gain) loss
(5,877
)
2,482

Gross benefits paid
(29,245
)
(32,386
)
Federal subsidy on benefits paid
1,932

2,041

Net benefit obligations at end of year
$
169,592

$
184,131

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

$
—

Employer contributions
18,883

21,490

Plan participants’ contributions
10,362

10,896

Gross benefits paid
(29,245
)
(32,386
)
Fair value of plan assets at end of year
$
—

$
—

Benefit obligation at end of year
$
169,592

$
184,131

Accrued postretirement benefit cost:
 
 
Current
$
19,655

$
20,432

Noncurrent
$
149,937

$
163,699