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COMPUTATION OF EARNINGS PER COMMON SHARE (Tables)
 9 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Common Share [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per common share for the three and nine months ended December 31, 2012 and 2011:

 
 
Three Months Ended
 
Nine Months Ended
 
 
December 31,
 
December 31,
(in thousands, except per share data)
 
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
 
Net income
 
$
28,206

 
$
30,898

 
$
77,693

 
$
85,150

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 

 
 
 
 
Weighted average common shares-basic
 
41,745

 
42,541

 
41,629

 
44,623

Dilutive effect of employee equity incentive plans
 
873

 
1,099

 
950

 
1,234

Weighted average common shares-diluted
 
42,618

 
43,640

 
42,579

 
45,857

 
 
 
 
 
 
 
 
 
Basic earnings per common share
 
$
0.68

 
$
0.73

 
$
1.87

 
$
1.91

 
 
 
 
 
 
 
 
 
Diluted earnings per common share
 
$
0.66

 
$
0.71

 
$
1.82

 
$
1.86

 
 
 
 
 
 
 
 
 
Potentially dilutive securities excluded from diluted earnings per common share because their effect is anti-dilutive
 
1,210

 
1,092

 
1,125

 
1,458