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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
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
 
 
2017
 
2016
 
2015
 
 
(thousands)
Beginning Balance, net of taxes
 
$
(83,012
)
 
$
(93,015
)
 
$
(101,498
)
Net actuarial gain, current-period changes, before taxes
 
7,067

 
9,622

 
8,406

Amortization of actuarial loss, amounts reclassified from accumulated other comprehensive loss, before taxes (a)
 
1,686

 
2,484

 
4,884

Effect of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes (a)
 
—

 
4,155

 
501

Income taxes
 
(2,443
)
 
(6,258
)
 
(5,308
)
Ending Balance, net of taxes
 
$
(76,702
)
 
$
(83,012
)
 
$
(93,015
)

___________________________________ 
 
(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.