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Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Stock-based compensation expense charged to the Condensed Consolidated Statements of Operations is as follows:
 
 
Three months ended September 30,
 
Nine months ended September 30,
(dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Stock-based compensation expense
 
$
671

 
$
782

 
$
2,127

 
$
2,930
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
The effect of the retrospective presentation change related to the net periodic pension and non-pension benefit costs (credits) on our Condensed Consolidated Statement of Operations was as follows:
 
 
Three months ended September 30, 2017
 
Nine months ended September 30, 2017
(dollars in thousands)
 
Previously Reported
 
Reclassification
 
As Revised
 
Previously Reported
 
Reclassification
 
As Revised
Cost of sales
 
$
151,202

 
$
(806
)
 
$
150,396

 
$
452,041

 
$
(2,304
)
 
$
449,737

Selling, general and administrative expenses
 
29,082

 
378

 
29,460

 
95,733

 
1,142

 
96,875

Other income (expense)
 
621

 
(428
)
 
193

 
(2,283
)
 
(1,162
)
 
(3,445
)