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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Changes in Accumulated Other Comprehensive Loss [Table Text Block]
Changes in accumulated other comprehensive loss are as follows:

 
 
Changes in Accumulated Other Comprehensive Loss
 
 
Year Ended December 31
 
 
2018
 
2017
 
2016
 
 
(thousands)
Beginning Balance, net of taxes
 
$
(76,702
)
 
$
(83,012
)
 
$
(93,015
)
Net actuarial gain, before taxes
 
14,178

 
7,067

 
9,622

Amortization of actuarial loss, before taxes (a)
 
1,497

 
1,686

 
2,484

Effect of settlements, before taxes (a)
 
23,255

 
—

 
4,155

Income taxes
 
(9,880
)
 
(2,443
)
 
(6,258
)
Ending Balance, net of taxes
 
$
(47,652
)
 
$
(76,702
)
 
$
(83,012
)

___________________________________ 
 
(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 12, Retirement and Benefit Plans.