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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2018 and 2017:

 
Three Months Ended
June 30
 
Six Months Ended
June 30
 
2018
 
2017
 
2018
 
2017
 
(thousands)
Beginning balance, net of taxes
$
(76,089
)
 
$
(82,769
)
 
$
(76,702
)
 
$
(83,012
)
Net actuarial gain, before taxes
13,340

 
—

 
13,340

 
—

Amortization of actuarial loss, before taxes (a)
356

 
410

 
1,177

 
805

Effect of settlements, before taxes (a)
12,003

 
—

 
12,003

 
—

Income taxes
(6,517
)
 
(158
)
 
(6,725
)
 
(310
)
Ending balance, net of taxes
$
(56,907
)
 
$
(82,517
)
 
$
(56,907
)
 
$
(82,517
)
___________________________________ 
 
(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.