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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2019
Stockholders' Equity Note [Abstract]  
Changes in Accumulated Other Comprehensive Loss [Table Text Block]
The following table details the changes in accumulated other comprehensive loss for the three months ended March 31, 2019 and 2018:

 
Three Months Ended
March 31
 
2019
 
2018
 
(thousands)
Beginning balance, net of taxes
$
(47,652
)
 
$
(76,702
)
Amortization of actuarial (gain) loss, before taxes (a)
(43
)
 
821

Income taxes
11

 
(208
)
Ending balance, net of taxes
$
(47,684
)
 
$
(76,089
)
___________________________________ 
 
(a)
Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 8, Retirement and Benefit Plans.