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Share-Based Employee Compensation (Tables)
3 Months Ended
Mar. 31, 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 months ended March 31, 2019 and 2018 for share-based compensation, including expense for restricted stock units, performance share units, stock options and cash settled stock appreciation rights.
 
Three Months Ended
March 31,
 
2019
 
2018
 
In thousands
Cost of sales
$
249

 
$
213

Operating expenses
3,186

 
2,786

Total cost of share-based compensation included in income, before income tax
$
3,435

 
$
2,999