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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) Net of Tax (Tables)
 3 Months Ended
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]  
Comprehensive Income (Loss) [Table Text Block]
Other comprehensive income components, net of tax, are shown in the following table for the three-month periods ended March 31, 2017 and 2016:

(in thousands)
 
Changes in pension plan assets and benefit obligations
 
Unrecognized gains and losses on available for sale securities
 
Total
Beginning balance at January 1, 2017
 
$
(14,740
)
 
$
(3,005
)
 
$
(17,745
)
 
Other comprehensive income before reclassifications
 
—

 
1,022

 
1,022

 
Amounts reclassified from accumulated other comprehensive loss
 
—

 
—

 
—

Net current period other comprehensive income
 
—

 
1,022

 
1,022

Ending balance at March 31, 2017
 
$
(14,740
)
 
$
(1,983
)
 
$
(16,723
)
 
 
 
 
 
 
 
 
Beginning balance at January 1, 2016
 
$
(15,351
)
 
$
(292
)
 
$
(15,643
)
 
Other comprehensive income before reclassifications
 
—

 
11,680

 
11,680

 
Amounts reclassified from accumulated other comprehensive loss
 
—

 
—

 
—

Net current period other comprehensive income
 
—

 
11,680

 
11,680

Ending balance at March 31, 2016
 
$
(15,351
)
 
$
11,388

 
$
(3,963
)