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Accumulated Other Comprehensive Earnings (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Earnings (Losses)
 
 
AFS Securities
 
Postretirement Benefit
 
Accumulated Other Comprehensive Earnings
 
 
 
(Amounts are in thousands)
 
Balances at December 28, 2013
 
 
$
94,836

 
 
 
(7,837
)
 
 
 
86,999

 
Unrealized gain on AFS securities
 
 
58,968




—




58,968

 
Net realized gain on AFS securities reclassified to investment income
 
 
(35,842
)
 
 
 
—

 
 
 
(35,842
)
 
Amortization of actuarial loss reclassified to operating and administrative expenses
 
 
—

 
 
 
(991
)
 
 
 
(991
)
 
Net other comprehensive earnings (losses)
 
 
23,126

 
 
 
(991
)
 
 
 
22,135

 
Balances at December 27, 2014
 
 
117,962

 
 
 
(8,828
)
 
 
 
109,134

 
Unrealized loss on AFS securities
 
 
(43,838
)
 
 
 
—

 
 
 
(43,838
)
 
Net realized gain on AFS securities reclassified to investment income
 
 
(42,829
)
 
 
 
—

 
 
 
(42,829
)
 
Amortization of actuarial gain reclassified to operating and administrative expenses
 
 
—

 
 
 
3,801

 
 
 
3,801

 
Net other comprehensive (losses) earnings
 
 
(86,667
)
 
 
 
3,801

 
 
 
(82,866
)
 
Balances at December 26, 2015
 
 
31,295

 
 
 
(5,027
)
 
 
 
26,268

 
Unrealized gain on AFS securities


17,615




—




17,615

 
Net realized gain on AFS securities reclassified to investment income
 
 
(19,792
)
 
 
 
—

 
 
 
(19,792
)
 
Amortization of actuarial loss reclassified to operating and administrative expenses
 
 
—

 
 
 
(664
)
 
 
 
(664
)
 
Net other comprehensive losses
 
 
(2,177
)
 
 
 
(664
)
 
 
 
(2,841
)
 
Balances at December 31, 2016
 
 
$
29,118

 
 
 
(5,691
)
 
 
 
23,427