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Accumulated Other Comprehensive Earnings (Tables)
 9 Months Ended
Sep. 29, 2018
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 September 29, 2018 and September 30, 2017 is as follows:
 
 
Investments
 
Postretirement Benefits
 
Accumulated Other Comprehensive Earnings
 
 
 
(Amounts are in thousands)
 
2018
 
 
 
 
 
 
 
 
 
 
 
 
Balances at June 30, 2018
 
 
$
(56,387
)
 
 
 
(14,292
)
 
 
 
(70,679
)
 
Unrealized loss on debt securities
 
 
(2,076
)
 
 
 
—

 
 
 
(2,076
)
 
Net realized gain on debt securities reclassified to investment income
 
 
(181
)
 
 
 
—

 
 
 
(181
)
 
Amortization of actuarial loss reclassified to other nonoperating income, net
 
 
—

 
 
 
564

 
 
 
564

 
Net other comprehensive (losses) earnings
 
 
(2,257
)
 
 
 
564

 
 
 
(1,693
)
 
Balances at September 29, 2018
 
 
$
(58,644
)
 
 
 
(13,728
)
 
 
 
(72,372
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
Balances at July 1, 2017
 
 
$
33,639

 
 
 
(5,691
)
 
 
 
27,948

 
Unrealized gain on debt and equity securities
 
 
49,043

 
 
 
—

 
 
 
49,043

 
Net realized gain on debt and equity 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

 


A reconciliation of the changes in accumulated other comprehensive earnings (losses) net of income taxes for the nine months ended September 29, 2018 and September 30, 2017 is as follows:
 
 
Investments
 
Postretirement Benefits
 
Accumulated Other Comprehensive Earnings
 
 
 
(Amounts are in thousands)
 
2018
 
 
 
 
 
 
 
 
 
 
 
 
Balances at December 30, 2017
 
 
$
168,057

 
 
 
(15,421
)
 
 
 
152,636

 
Unrealized loss on debt securities
 
 
(28,657
)
 
 
 
—

 
 
 
(28,657
)
 
Net realized loss on debt securities reclassified to investment income
 
 
266

 
 
 
—

 
 
 
266

 
Amortization of actuarial loss reclassified to other nonoperating income, net
 
 
—

 
 
 
1,693

 
 
 
1,693

 
Net other comprehensive (losses) earnings
 
 
(28,391
)
 
 
 
1,693

 
 
 
(26,698
)
 
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings
 
 
(198,310
)
 
 
 
—

 
 
 
(198,310
)
 
Balances at September 29, 2018
 
 
$
(58,644
)
 
 
 
(13,728
)
 
 
 
(72,372
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
Balances at December 31, 2016
 
 
$
29,118

 
 
 
(5,691
)
 
 
 
23,427

 
Unrealized gain on debt and equity securities
 
 
111,585

 
 
 
—

 
 
 
111,585

 
Net realized gain on debt and equity 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