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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in accumulated other comprehensive loss are as follows:

 
 
Changes in Accumulated Other Comprehensive Loss
 
 
Year Ended December 31
 
 
2015
 
2014
 
2013
 
 
(thousands)
Beginning Balance, net of taxes
 
$
(101,498
)
 
$
(55,249
)
 
$
(121,229
)
Net actuarial gain (loss), current-period changes, before taxes
 
8,406

 
(75,016
)
 
97,171

Amortization of actuarial (gain) loss, amounts reclassified from accumulated other comprehensive loss, before taxes (a)
 
4,884

 
(23
)
 
9,202

Effect of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes (a)
 
501

 
—

 
—

Amortization of prior service costs and other, amounts reclassified from accumulated other comprehensive loss, before taxes (a)
 
—

 
—

 
304

Income taxes
 
(5,308
)
 
28,790

 
(40,697
)
Ending Balance, net of taxes
 
$
(93,015
)
 
$
(101,498
)
 
$
(55,249
)

___________________________________ 
 
(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 7, Retirement and Benefit Plans.