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STOCK-BASED COMPENSATION
 9 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
STOCK-BASED COMPENSATION
STOCK-BASED COMPENSATION

The Company recognizes the grant-date fair value of stock-based compensation as compensation expense using the straight-line attribution approach over the service period for which the stock-based compensation is expected to vest. The following table summarizes the amount of stock-based compensation included in the condensed consolidated statements of operations:
 
 
Three Months Ended December 31,
 
Nine Months Ended 
 December 31,
(in thousands)
 
2016
 
2017
 
2016
 
2017
Cost of revenues
 
$
794

 
$
917

 
$
2,414

 
$
2,709

 
 
 
 
 
 
 
 
 
Research, development, and engineering
 
1,771

 
2,049

 
6,663

 
6,158

Selling, general, and administrative
 
6,124

 
5,063

 
15,928

 
17,180

Stock-based compensation included in operating expenses
 
7,895

 
7,112

 
22,591

 
23,338

Total stock-based compensation
 
8,689

 
8,029

 
25,005

 
26,047

Income tax expense (benefit)
 
(2,986
)
 
2,039

 
(8,635
)
 
(5,650
)
Total stock-based compensation, net of tax
 
$
5,703

 
$
10,068

 
$
16,370

 
$
20,397