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Share-Based Employee Compensation (Tables)
6 Months Ended
Jun. 30, 2019
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, 2019 and 2018 for share-based compensation, including expense for restricted stock units and performance share units (in thousands).
 
Three Months Ended June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
 
 
 
 
Cost of sales
$
247

 
$
256

 
$
502

 
$
470

Operating expenses
3,283

 
3,208

 
6,463

 
5,994

Total cost of share-based compensation included in income, before income tax
$
3,530

 
$
3,464

 
$
6,965

 
$
6,464