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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2019 and 2018:

 
Three Months Ended
September 30
 
Nine Months Ended
September 30
 
2019
 
2018
 
2019
 
2018
 
(thousands)
Beginning balance, net of taxes
$
(47,717
)
 
$
(56,907
)
 
$
(47,652
)
 
$
(76,702
)
Net actuarial gain (loss), before taxes
—

 
(3,874
)
 
—

 
9,466

Amortization of actuarial (gain) loss, before taxes (a)
(44
)
 
151

 
(131
)
 
1,328

Effect of settlements, before taxes (a)
1,342

 
11,252

 
1,342

 
23,255

Income taxes
(329
)
 
(1,909
)
 
(307
)
 
(8,634
)
Ending balance, net of taxes
$
(46,748
)
 
$
(51,287
)
 
$
(46,748
)
 
$
(51,287
)
___________________________________ 
 
(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.