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Shareholders' Equity (Tables)
 12 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Schedule of dividend declared
 
   
Per Share
      
Total Amount
    
Declaration Date
  
Dividend
  
Record Date
  
(In thousands)
  
Payment Date
                     
May 7, 2012
   $ 0.150  
May 14, 2012
   $ 3,050  
May 25, 2012
July 30, 2012
   $ 0.150  
August 13, 2012
   $ 3,049  
August 24, 2012
October 29, 2012
   $ 0.150  
November 9, 2012
   $ 3,001  
November 23, 2012
December 3, 2012
   $ 1.000  
December 14, 2012
   $ 20,001  
December 24, 2012
January 28, 2013
   $ 0.150  
February 8, 2013
   $ 3,000  
February 22, 2013