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Accumulated Other Comprehensive Earnings (Tables)
 12 Months Ended
Dec. 28, 2019
Equity [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Earnings (Losses) [Table Text Block]
 
 
Investments
 
Postretirement Benefit
 
Accumulated Other Comprehensive Earnings (Losses)
 
 
 
(Amounts are in thousands)
 
Balances at December 31, 2016
 
 
$
29,118

 
 
 
(5,691
)
 
 
 
23,427

 
Unrealized gain on debt and equity securities
 
 
175,978




—




175,978

 
Net realized gain on debt and equity securities reclassified to investment income
 
 
(66,836
)
 
 
 
—

 
 
 
(66,836
)
 
Adjustment to postretirement benefit obligation
 
 
—

 
 
 
(6,997
)
 
 
 
(6,997
)
 
Net other comprehensive earnings (losses)
 
 
109,142

 
 
 
(6,997
)
 
 
 
102,145

 
Remeasurement of deferred income taxes reclassified to retained earnings

 
 
29,797

 
 
 
(2,733
)
 
 
 
27,064

 
Balances at December 30, 2017
 
 
168,057

 
 
 
(15,421
)
 
 
 
152,636

 
Unrealized loss on debt securities
 
 
(19,126
)
 
 
 
—

 
 
 
(19,126
)
 
Net realized loss on debt securities reclassified to investment income
 
 
346

 
 
 
—

 
 
 
346

 
Adjustment to postretirement benefit obligation
 
 
—

 
 
 
8,692

 
 
 
8,692

 
Net other comprehensive (losses) earnings
 
 
(18,780
)
 
 
 
8,692

 
 
 
(10,088
)
 
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings
 
 
(198,310
)
 
 
 
—

 
 
 
(198,310
)
 
Balances at December 29, 2018
 
 
(49,033
)
 
 
 
(6,729
)
 
 
 
(55,762
)
 
Unrealized gain on debt securities


148,141




—




148,141

 
Net realized gain on debt securities reclassified to investment income
 
 
(602
)
 
 
 
—

 
 
 
(602
)
 
Adjustment to postretirement benefit obligation
 
 
—

 
 
 
(10,488
)
 
 
 
(10,488
)
 
Net other comprehensive earnings (losses)
 
 
147,539

 
 
 
(10,488
)
 
 
 
137,051

 
Balances at December 28, 2019
 
 
$
98,506

 
 
 
(17,217
)
 
 
 
81,289