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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Expense Included in Statements of Operations
The following table summarizes the amount of stock-based compensation included in the condensed consolidated statements of operations:
 
 
Three Months Ended 
 June 30,
(in thousands)
 
2016
 
2017
Cost of revenues
 
$
842

 
$
902

 
 
 
 
 
Research, development, and engineering
 
2,484

 
2,101

Selling, general, and administrative
 
5,087

 
6,253

Stock-based compensation included in operating expenses
 
7,571

 
8,354

Total stock-based compensation
 
8,413

 
9,256

Income tax benefit
 
(2,772
)
 
(4,849
)
Total stock-based compensation, net of tax
 
$
5,641

 
$
4,407