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Share-Based Employee Compensation (Tables)
6 Months Ended
Jun. 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 six months ended June 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 June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
 
 
Cost of sales
$
256

 
$
146

 
$
470

 
$
363

Operating expenses
3,208

 
2,039

 
5,994

 
5,007

Total cost of share-based compensation included in income, before income tax
$
3,464

 
$
2,185

 
$
6,464

 
$
5,370