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Accumulated Other Comprehensive Earnings (Tables)
 6 Months Ended
Jul. 01, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive Earnings
A reconciliation of the changes in accumulated other comprehensive earnings net of income taxes for the three months ended July 1, 2017 and June 25, 2016 is as follows:
 
 
AFS Securities
 
Postretirement Benefits
 
Accumulated Other Comprehensive Earnings
 
 
 
(Amounts are in thousands)
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
Balances at April 1, 2017
 
 
$
48,849

 
 
 
(5,691
)
 
 
 
43,158

 
Unrealized gain on AFS securities
 
 
23,624

 
 
 
—

 
 
 
23,624

 
Net realized gain on AFS securities reclassified to investment income
 
 
(38,834
)
 
 
 
—

 
 
 
(38,834
)
 
Net other comprehensive losses
 
 
(15,210
)
 
 
 
—

 
 
 
(15,210
)
 
Balances at July 1, 2017
 
 
$
33,639

 
 
 
(5,691
)
 
 
 
27,948

 
 
 
 
 
 
 
 
 
 
 
 
 
 
2016
 
 
 
 
Balances at March 26, 2016
 
 
$
38,765

 
 
 
(5,027
)
 
 
 
33,738

 
Unrealized gain on AFS securities
 
 
21,791

 
 
 
—

 
 
 
21,791

 
Net realized gain on AFS securities reclassified to investment income
 
 
(731
)
 
 
 
—

 
 
 
(731
)
 
Net other comprehensive earnings
 
 
21,060

 
 
 
—

 
 
 
21,060

 
Balances at June 25, 2016
 
 
$
59,825

 
 
 
(5,027
)
 
 
 
54,798

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
AFS Securities
 
Postretirement Benefits
 
Accumulated Other Comprehensive Earnings
 
 
 
(Amounts are in thousands)
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
Balances at December 31, 2016
 
 
$
29,118

 
 
 
(5,691
)
 
 
 
23,427

 
Unrealized gain on AFS securities
 
 
62,542

 
 
 
—

 
 
 
62,542

 
Net realized gain on AFS securities reclassified to investment income
 
 
(58,021
)
 
 
 
—

 
 
 
(58,021
)
 
Net other comprehensive earnings
 
 
4,521

 
 
 
—

 
 
 
4,521

 
Balances at July 1, 2017
 
 
$
33,639

 
 
 
(5,691
)
 
 
 
27,948

 
 
 
 
 
 
 
 
 
 
 
 
 
 
2016
 
 
 
 
Balances at December 26, 2015
 
 
$
31,295

 
 
 
(5,027
)
 
 
 
26,268

 
Unrealized gain on AFS securities
 
 
32,756

 
 
 
—

 
 
 
32,756

 
Net realized gain on AFS securities reclassified to investment income
 
 
(4,226
)
 
 
 
—

 
 
 
(4,226
)
 
Net other comprehensive earnings
 
 
28,530

 
 
 
—

 
 
 
28,530

 
Balances at June 25, 2016
 
 
$
59,825

 
 
 
(5,027
)
 
 
 
54,798