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Accumulated Other Comprehensive Earnings (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2018 and July 1, 2017 is as follows:
 
 
Investments
 
Postretirement Benefits
 
Accumulated Other Comprehensive Earnings
 
 
 
(Amounts are in thousands)
 
2018
 
 
 
 
 
 
 
 
 
 
 
 
Balances at March 31, 2018
 
 
$
(54,212
)
 
 
 
(14,856
)
 
 
 
(69,068
)
 
Unrealized loss on debt securities
 
 
(2,600
)
 
 
 
—

 
 
 
(2,600
)
 
Net realized loss on debt securities reclassified to investment income
 
 
425

 
 
 
—

 
 
 
425

 
Amortization of actuarial loss reclassified to operating and administrative expenses
 
 
—

 
 
 
564

 
 
 
564

 
Net other comprehensive (losses) earnings
 
 
(2,175
)
 
 
 
564

 
 
 
(1,611
)
 
Balances at June 30, 2018
 
 
$
(56,387
)
 
 
 
(14,292
)
 
 
 
(70,679
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
Balances at April 1, 2017
 
 
$
48,849

 
 
 
(5,691
)
 
 
 
43,158

 
Unrealized gain on debt and equity securities
 
 
23,624

 
 
 
—

 
 
 
23,624

 
Net realized gain on debt and equity securities reclassified to investment income
 
 
(38,834
)
 
 
 
—

 
 
 
(38,834
)
 
Net other comprehensive losses
 
 
(15,210
)
 
 
 
—

 
 
 
(15,210
)
 
Balances at July 1, 2017
 
 
$
33,639

 
 
 
(5,691
)
 
 
 
27,948

 


A reconciliation of the changes in accumulated other comprehensive earnings (losses) net of income taxes for the six months ended June 30, 2018 and July 1, 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
 
 
(26,581
)
 
 
 
—

 
 
 
(26,581
)
 
Net realized loss on debt securities reclassified to investment income
 
 
447

 
 
 
—

 
 
 
447

 
Amortization of actuarial loss reclassified to operating and administrative expenses
 
 
—

 
 
 
1,129

 
 
 
1,129

 
Net other comprehensive (losses) earnings
 
 
(26,134
)
 
 
 
1,129

 
 
 
(25,005
)
 
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings
 
 
(198,310
)
 
 
 
—

 
 
 
(198,310
)
 
Balances at June 30, 2018
 
 
$
(56,387
)
 
 
 
(14,292
)
 
 
 
(70,679
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
Balances at December 31, 2016
 
 
$
29,118

 
 
 
(5,691
)
 
 
 
23,427

 
Unrealized gain on debt and equity securities
 
 
62,542

 
 
 
—

 
 
 
62,542

 
Net realized gain on debt and equity securities reclassified to investment income
 
 
(58,021
)
 
 
 
—

 
 
 
(58,021
)
 
Net other comprehensive earnings
 
 
4,521

 
 
 
—

 
 
 
4,521

 
Balances at July 1, 2017
 
 
$
33,639

 
 
 
(5,691
)
 
 
 
27,948