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EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION (Tables)
 6 Months Ended
Sep. 30, 2017
EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION [Abstract]  
Total Share-based Compensation Expense, Net of Tax
The following table summarizes total share-based compensation expense, net of tax, related to restricted stock units, and represents our results from continuing operations, during the three and six months ended September 30, 2017 and 2016, which is included in our condensed consolidated statements of income (in thousands, except per share data):

  
Three Months Ended
September 30,
  
Six Months Ended
September 30,
 
  
2017
  
2016
  
2017
  
2016
 
Cost of revenues
 
$
384
  
$
487
  
$
751
  
$
966
 
Research and development
  
782
   
684
   
1,543
   
1,278
 
Sales and marketing
  
1,088
   
717
   
2,332
   
1,421
 
General and administrative
  
1,254
   
1,178
   
1,993
   
2,220
 
Share-based compensation expense before income taxes
  
3,508
   
3,066
   
6,619
   
5,885
 
Income tax benefit
  
(1,203
)
  
(1,058
)
  
(2,277
)
  
(2,042
)
Total share-based compensation expense after income taxes
 
$
2,305
  
$
2,008
  
$
4,342
  
$
3,843
 
Net impact of share-based compensation on:
                
Basic net income per share
 
$
0.10
  
$
0.09
  
$
0.19
  
$
0.17
 
Diluted net income per share
 
$
0.10
  
$
0.09
  
$
0.19
  
$
0.17
 
Restricted Stock Unit Activity
The following table summarizes restricted stock unit activity for the six months ended September 30, 2017.
 
  
Time-Based
Restricted Stock Units
  
Performance-Based
Restricted Stock Units
 
  
Number of
Shares
  
Weighted
Average
Grant Date
Fair Value (1)
  
Number of
Shares
  
Weighted
Average
Grant Date
Fair Value (1)
 
Nonvested at March 31, 2017
  
535,000
  
$
46.62
   
439,000
  
$
47.40
 
Granted
  
236,000
   
46.35
   
137,000
   
45.84
 
Vested (2)
  
(140,000
)
  
43.90
   
(62,000
)
  
40.82
 
Canceled and forfeited
  
(4,000
)
  
46.96
   
-
   
-
 
Nonvested at September 30, 2017
  
627,000
  
$
47.12
   
514,000
  
$
47.78
 
 
(1)
The weighted average grant date fair value of restricted stock units is based on the number of shares and the closing market price of our common stock on the date of grant.
(2)
The number of restricted stock units vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.