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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
The effect of the retrospective presentation change related to the net periodic pension and non-pension benefit costs (credits) on our Consolidated Statement of Operations was as follows:
 
 
Year ended December 31, 2017
(dollars in thousands)
 
Previously Reported
 
Reclassification
 
As Revised
Cost of sales
 
$
634,185

 
$
(3,070
)
 
$
631,115

Selling, general and administrative expenses
 
124,926

 
1,279

 
126,205

Other income (expense)
 
(3,515
)
 
(1,791
)
 
(5,306
)