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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2019 and 2018:

 
Three Months Ended
June 30
 
Six Months Ended
June 30
 
2019
 
2018
 
2019
 
2018
 
(thousands)
Beginning balance, net of taxes
$
(47,684
)
 
$
(76,089
)
 
$
(47,652
)
 
$
(76,702
)
Net actuarial gain, before taxes
—

 
13,340

 
—

 
13,340

Amortization of actuarial (gain) loss, before taxes (a)
(44
)
 
356

 
(87
)
 
1,177

Effect of settlements, before taxes (a)
—

 
12,003

 
—

 
12,003

Income taxes
11

 
(6,517
)
 
22

 
(6,725
)
Ending balance, net of taxes
$
(47,717
)
 
$
(56,907
)
 
$
(47,717
)
 
$
(56,907
)
___________________________________ 
 
(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 9, Retirement and Benefit Plans.