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Postretirement benefits other than pensions (Tables) (Other Postretirement Benefit Plans, Defined Benefit)
 12 Months Ended
Dec. 29, 2013
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
 
2013
2012
2011
Service cost – benefits earned during the period
$
529

$
545

$
611

Interest cost on net benefit obligation
5,656

7,744

9,205

Amortization of prior service credit
(9,165
)
(19,190
)
(19,510
)
Amortization of actuarial loss
1,169

1,943

5,444

Net periodic postretirement benefit credit
$
(1,811
)
$
(8,958
)
$
(4,250
)
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. 29, 2013
Dec. 30, 2012
Change in benefit obligations
 
 
Net benefit obligations at beginning of year
$
169,592

$
184,131

Service cost
529

545

Interest cost
5,656

7,744

Plan participants’ contributions
9,629

10,362

Plan amendments
(496
)
—

Actuarial gain
(16,476
)
(5,877
)
Gross benefits paid
(28,022
)
(29,245
)
Federal subsidy on benefits paid
4,169

1,932

Acquisitions
2,228

—

Net benefit obligations at end of year
$
146,809

$
169,592

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

$
—

Employer contributions
18,393

18,883

Plan participants’ contributions
9,629

10,362

Gross benefits paid
(28,022
)
(29,245
)
Fair value of plan assets at end of year
$
—

$
—

Benefit obligation at end of year
$
146,809

$
169,592

Amounts recognized in Consolidated Balance Sheets
Accrued benefit cost—current
$
17,731

$
19,655

Accrued benefit cost—noncurrent
$
129,078

$
149,937
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
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. 29, 2013
Dec. 30, 2012
Net actuarial losses
$
(6,087
)
$
(23,467
)
Prior service credit
16,204

24,874

Amounts in accumulated other comprehensive income (loss)
$
10,117

$
1,407
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
 
2013
Current year actuarial gain
$
16,210

Change in prior service cost
496

Amortization of actuarial loss
1,169

Amortization of prior service credit
(9,165
)
Total
$
8,710
Assumptions Used to Determine Defined Benefit Plans Costs
Postretirement benefit costs: The following assumptions were used to determine postretirement benefit cost:
 
2013
2012
2011
Discount rate
3.80
%
4.75
%
5.30
%
Health care cost trend rate assumed for next year
7.17
%
6.50
%
6.50
%
Ultimate trend rate
5.00
%
5.00
%
5.00
%
Year that ultimate trend rate is reached
2017

2016

2015
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. 29, 2013
Dec. 30, 2012
Discount rate
4.75
%
3.80
%
Health care cost trend rate assumed for
next year
7.17
%
6.50
%
Ultimate trend rate
5.00
%
5.00
%
Year that ultimate trend rate is reached
2017

2016
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
2014
$
17,731

$
2,812

2015
$
16,857

$
2,738

2016
$
15,998

$
2,649

2017
$
15,123

$
2,580

2018
$
15,077

$
2,495

2019-2023
$
60,528

$
10,530