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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
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
 
 
2016
 
2015
 
2014
 
 
(thousands)
Beginning Balance, net of taxes
 
$
(93,015
)
 
$
(101,498
)
 
$
(55,249
)
Net actuarial gain (loss), current-period changes, before taxes
 
9,622

 
8,406

 
(75,016
)
Amortization of actuarial (gain) loss, amounts reclassified from accumulated other comprehensive loss, before taxes (a)
 
2,484

 
4,884

 
(23
)
Effect of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes (a)
 
4,155

 
501

 
—

Income taxes
 
(6,258
)
 
(5,308
)
 
28,790

Ending Balance, net of taxes
 
$
(83,012
)
 
$
(93,015
)
 
$
(101,498
)

___________________________________ 
 
(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.