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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 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 months ended March 31, 2016 and 2015:

 
Three Months Ended
March 31
 
2016
 
2015
 
(thousands)
Beginning Balance, net of taxes
$
(93,015
)
 
$
(101,498
)
Amortization of actuarial loss, before taxes (a)
478

 
1,598

Effect of settlements, before taxes (a)
297

 
501

Income taxes
(298
)
 
(805
)
Ending Balance, net of taxes
$
(92,538
)
 
$
(100,204
)
___________________________________ 
 
(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.