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Share-Based Employee Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The table below summarizes the amounts recognized in the financial statements for the three and nine months ended September 30, 2018 and 2017 for share-based compensation, including expense for restricted stock units, performance share units, stock options and cash settled stock appreciation rights.
 
Three Months Ended September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
 
 
Cost of sales
$
253

 
$
287

 
$
722

 
$
650

Operating expenses
3,259

 
3,894

 
9,253

 
8,901

Total cost of share-based compensation included in income, before income tax
$
3,512

 
$
4,181

 
$
9,975

 
$
9,551