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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
The following table details the changes in accumulated other comprehensive loss for the three months ended March 31, 2018 and 2017:

 
Three Months Ended
March 31
 
2018
 
2017
 
(thousands)
Beginning balance, net of taxes
$
(76,702
)
 
$
(83,012
)
Amortization of actuarial loss, before taxes (a)
821

 
395

Income taxes
(208
)
 
(152
)
Ending balance, net of taxes
$
(76,089
)
 
$
(82,769
)
___________________________________ 
 
(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 7, Retirement and Benefit Plans.