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SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Tables)
 12 Months Ended
Mar. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
Quarter Ended
 
March 31,
2012
 
December 31,
2011
 
September 30,
2011
 
June 30,
2011
 
(in thousands, except per share data)
Net revenues
$
177,584

 
$
183,236

 
$
176,948

 
$
175,600

Gross profit
$
95,115

 
$
96,212

 
$
98,966

 
$
94,058

Net income
$
23,886

 
$
30,898

 
$
27,521

 
$
26,731

Basic net income per common share
$
0.57

 
$
0.73

 
$
0.62

 
$
0.57

Diluted net income per common share
$
0.55

 
$
0.71

 
$
0.60

 
$
0.56

Cash dividends declared per common share
$
0.05

 
$
0.05

 
$
0.05

 
$
0.05

 
Quarter Ended
 
March 31, 2011 1
 
December 31,
2010
 
September 30, 2010
 
June 30, 2010
 
(in thousands, except per share data)
Net revenues
$
173,077

 
$
181,585

 
$
158,255

 
$
170,685

Gross profit
$
90,541

 
$
95,808

 
$
85,959

 
$
89,448

Net income
$
26,316

 
$
31,552

 
$
25,429

 
$
25,946

Basic net income per common share
$
0.55

 
$
0.66

 
$
0.54

 
$
0.54

Diluted net income per common share
$
0.53

 
$
0.64

 
$
0.52

 
$
0.52

Cash dividends declared per common share
$
0.05

 
$
0.05

 
$
0.05

 
$
0.05