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Accumulated Other Comprehensive Earnings (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2017 and September 24, 2016 is as follows:
 
 
AFS Securities
 
Postretirement Benefits
 
Accumulated Other Comprehensive Earnings
 
 
 
(Amounts are in thousands)
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
Balances at July 1, 2017
 
 
$
33,639

 
 
 
(5,691
)
 
 
 
27,948

 
Unrealized gain on AFS securities
 
 
49,043

 
 
 
—

 
 
 
49,043

 
Net realized gain on AFS securities reclassified to investment income
 
 
(6,334
)
 
 
 
—

 
 
 
(6,334
)
 
Net other comprehensive earnings
 
 
42,709

 
 
 
—

 
 
 
42,709

 
Balances at September 30, 2017
 
 
$
76,348

 
 
 
(5,691
)
 
 
 
70,657

 
 
 
 
 
 
 
 
 
 
 
 
 
 
2016
 
 
 
 
Balances at June 25, 2016
 
 
$
59,825

 
 
 
(5,027
)
 
 
 
54,798

 
Unrealized gain on AFS securities
 
 
21,263

 
 
 
—

 
 
 
21,263

 
Net realized gain on AFS securities reclassified to investment income
 
 
(3,725
)
 
 
 
—

 
 
 
(3,725
)
 
Net other comprehensive earnings
 
 
17,538

 
 
 
—

 
 
 
17,538

 
Balances at September 24, 2016
 
 
$
77,363

 
 
 
(5,027
)
 
 
 
72,336

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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
 
 
111,585

 
 
 
—

 
 
 
111,585

 
Net realized gain on AFS securities reclassified to investment income
 
 
(64,355
)
 
 
 
—

 
 
 
(64,355
)
 
Net other comprehensive earnings
 
 
47,230

 
 
 
—

 
 
 
47,230

 
Balances at September 30, 2017
 
 
$
76,348

 
 
 
(5,691
)
 
 
 
70,657

 
 
 
 
 
 
 
 
 
 
 
 
 
 
2016
 
 
 
 
Balances at December 26, 2015
 
 
$
31,295

 
 
 
(5,027
)
 
 
 
26,268

 
Unrealized gain on AFS securities
 
 
54,019

 
 
 
—

 
 
 
54,019

 
Net realized gain on AFS securities reclassified to investment income
 
 
(7,951
)
 
 
 
—

 
 
 
(7,951
)
 
Net other comprehensive earnings
 
 
46,068

 
 
 
—

 
 
 
46,068

 
Balances at September 24, 2016
 
 
$
77,363

 
 
 
(5,027
)
 
 
 
72,336