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Accumulated Other Comprehensive Earnings (Tables)
 3 Months Ended
Mar. 30, 2019
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
A reconciliation of the changes in accumulated other comprehensive earnings (losses) net of income taxes for the three months ended March 30, 2019 and March 31, 2018 is as follows:
 
 
Investments
 
Postretirement Benefit
 
Accumulated Other Comprehensive Earnings (Losses)
 
 
 
(Amounts are in thousands)
 
2019
 
 
 
 
 
 
 
 
 
 
 
 
Balances at December 29, 2018
 
 
$
(49,033
)
 
 
 
(6,729
)
 
 
 
(55,762
)
 
Unrealized gain on debt securities
 
 
59,521

 
 
 
—

 
 
 
59,521

 
Net realized loss on debt securities reclassified to investment income
 
 
293

 
 
 
—

 
 
 
293

 
Net other comprehensive earnings
 
 
59,814

 
 
 
—

 
 
 
59,814

 
Balances at March 30, 2019
 
 
$
10,781

 
 
 
(6,729
)
 
 
 
4,052

 
 
 
 
 
 
 
 
 
 
 
 
 
 
2018
 
 
 
 
Balances at December 30, 2017
 
 
$
168,057

 
 
 
(15,421
)
 
 
 
152,636

 
Unrealized loss on debt securities
 
 
(23,981
)
 
 
 
—

 
 
 
(23,981
)
 
Net realized loss on debt securities reclassified to investment income
 
 
22

 
 
 
—

 
 
 
22

 
Adjustment to postretirement benefit obligation
 
 
—

 
 
 
565

 
 
 
565

 
Net other comprehensive (losses) earnings
 
 
(23,959
)
 
 
 
565

 
 
 
(23,394
)
 
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings
 
 
(198,310
)
 
 
 
—

 
 
 
(198,310
)
 
Balances at March 31, 2018
 
 
$
(54,212
)
 
 
 
(14,856
)
 
 
 
(69,068
)