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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) Net of Tax (Tables)
 9 Months Ended
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]  
Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive income (loss) components, net of income tax, are shown in the following table for the three-month and nine-month periods ended September 30, 2018 and 2017:

(in thousands)
 
Changes in pension plan assets and benefit obligations
 
Change in unrealized losses on debt securities
 
Total
Beginning balance at July 1, 2018
 
$
(26,701
)
 
$
(28,308
)
 
$
(55,009
)
 
Other comprehensive loss before reclassifications
 
—

 
(5,141
)
 
(5,141
)
 
Amounts reclassified from accumulated other comprehensive loss
 
—

 
—

 
—

Net current period other comprehensive loss
 
—

 
(5,141
)
 
(5,141
)
Ending balance at September 30, 2018
 
$
(26,701
)
 
$
(33,449
)
 
$
(60,150
)
 
 
 
 
 
 
 
 
Beginning balance at July 1, 2017
 
$
(14,740
)
 
$
1,028

 
$
(13,712
)
 
Other comprehensive income before reclassifications
 
—

 
707

 
707

 
Amounts reclassified from accumulated other comprehensive loss
 
—

 
—

 
—

Net current period other comprehensive income
 
—

 
707

 
707

Ending balance at September 30, 2017
 
$
(14,740
)
 
$
1,735

 
$
(13,005
)



(in thousands)
 
Changes in pension plan assets and benefit obligations
 
Change in unrealized losses on debt securities
 
Total
Beginning balance at January 1, 2018
 
$
(23,526
)
 
$
(2,928
)
 
$
(26,454
)
 
Other comprehensive loss before reclassifications
 
—

 
(30,919
)
 
(30,919
)
 
Reclassification of disproportionate income tax effects
 
(3,175
)
 
(631
)
 
(3,806
)
 
Cumulative effect of change in accounting principle for marketable equity securities, net of tax
 
—

 
(995
)
 
(995
)
 
Amounts reclassified from accumulated other comprehensive loss
 
—

 
2,024

 
2,024

Activity for the period
 
(3,175
)
 
(30,521
)
 
(33,696
)
Ending balance at September 30, 2018
 
$
(26,701
)
 
$
(33,449
)
 
$
(60,150
)
 
 
 
 
 
 
 
 
Beginning balance at January 1, 2017
 
$
(14,740
)
 
$
(3,005
)
 
$
(17,745
)
 
Other comprehensive income before reclassifications
 
—

 
4,740

 
4,740

 
Amounts reclassified from accumulated other comprehensive loss
 
—

 
—

 
—

Net current period other comprehensive income
 
—

 
4,740

 
4,740

Ending balance at September 30, 2017
 
$
(14,740
)
 
$
1,735

 
$
(13,005
)