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Share-Based Employee Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
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 six months ended June 30, 2017 and 2016 for share-based compensation, including expense for stock options, restricted stock units, phantom stock units, cash settled stock appreciation rights and performance share units.
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
 
(In thousands)
 
 
 
 
Cost of sales
$
146

 
$
180

 
$
363

 
$
322

Operating expenses
2,039

 
2,303

 
5,007

 
4,213

Total cost of share-based compensation included in income, before income tax
$
2,185

 
$
2,483

 
$
5,370

 
$
4,535