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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016 and 2015:

 
Three Months Ended
June 30
 
Six Months Ended
June 30
 
2016
 
2015
 
2016
 
2015
 
(thousands)
Beginning Balance, net of taxes
$
(92,538
)
 
$
(100,204
)
 
$
(93,015
)
 
$
(101,498
)
Net actuarial gain, before taxes
—

 
19,345

 
—

 
19,345

Amortization of actuarial loss, before taxes (a)
478

 
1,312

 
956

 
2,910

Effect of settlements, before taxes (a)
—

 
—

 
297

 
501

Income taxes
(184
)
 
(7,926
)
 
(482
)
 
(8,731
)
Ending Balance, net of taxes
$
(92,244
)
 
$
(87,473
)
 
$
(92,244
)
 
$
(87,473
)
___________________________________ 
 
(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 8, Retirement and Benefit Plans.