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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015 and 2014:

 
Three Months Ended
June 30
 
Six Months Ended
June 30
 
2015
 
2014
 
2015
 
2014
 
(thousands)
Beginning Balance, net of taxes
$
(100,204
)
 
$
(55,253
)
 
$
(101,498
)
 
$
(55,249
)
Net actuarial gain, before taxes
19,345

 
—

 
19,345

 
—

Amortization of actuarial (gain) loss, amounts reclassified from accumulated other comprehensive loss, before taxes (a)
1,312

 
(6
)
 
2,910

 
(12
)
Effect of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes (a)
—

 
—

 
501

 
—

Income taxes
(7,926
)
 
2

 
(8,731
)
 
4

Ending Balance, net of taxes
$
(87,473
)
 
$
(55,257
)
 
$
(87,473
)
 
$
(55,257
)
___________________________________ 
 
(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 6, Retirement and Benefit Plans.