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Earnings Per Share (Tables)
 6 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Reconciliation [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per share:
 
 
Three Months Ended September 30,
 
Six Months Ended September 30,
(In thousands, except per share data)
 
2012
 
2011
 
2012
 
2011
Numerator
 
 
 
 
 
 
 
 
Net income
 
$
19,244

 
$
12,949

 
$
33,899

 
$
27,717

 
 
 

 
 

 
 
 
 
Denominator
 
 

 
 

 
 
 
 
Denominator for basic earnings per share — weighted average shares outstanding
 
50,364

 
50,278

 
50,353

 
50,231

Dilutive effect of unvested restricted common stock (including restricted stock units) and options issued to employees and directors
 
861

 
393

 
813

 
428

Denominator for diluted earnings per share
 
51,225

 
50,671

 
51,166

 
50,659

 
 
 

 
 

 
 
 
 
Earnings per Common Share:
 
 

 
 

 
 
 
 
Basic net earnings per share
 
$
0.38

 
$
0.26

 
$
0.67

 
$
0.55

 
 
 

 
 

 
 
 
 
Diluted net earnings per share
 
$
0.38

 
$
0.26

 
$
0.66

 
$
0.55