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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016:

 
Three Months Ended
June 30
 
Six Months Ended
June 30
 
2017
 
2016
 
2017
 
2016
 
(thousands)
Beginning Balance, net of taxes
$
(82,769
)
 
$
(92,538
)
 
$
(83,012
)
 
$
(93,015
)
Amortization of actuarial loss, before taxes (a)
410

 
478

 
805

 
956

Effect of settlements, before taxes (a)
—

 
—

 
—

 
297

Income taxes
(158
)
 
(184
)
 
(310
)
 
(482
)
Ending Balance, net of taxes
$
(82,517
)
 
$
(92,244
)
 
$
(82,517
)
 
$
(92,244
)
___________________________________ 
 
(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.