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Shareholders' Equity - Summary of dividends declared (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Declaration Date May 7, 2012
  
Stockholders Equity Note [Line Items]  
Declaration Date May 07, 2012
Per Share Dividend $ 0.150
Record Date May 14, 2012
Total Amount $ 3,050
Payment Date May 25, 2012
Declaration Date July 30, 2012
  
Stockholders Equity Note [Line Items]  
Declaration Date Jul. 30, 2012
Per Share Dividend $ 0.150
Record Date Aug. 13, 2012
Total Amount 3,049
Payment Date Aug. 24, 2012
Declaration Date October 29, 2012
  
Stockholders Equity Note [Line Items]  
Declaration Date Oct. 29, 2012
Per Share Dividend $ 0.150
Record Date Nov. 09, 2012
Total Amount 3,001
Payment Date Nov. 23, 2012
Declaration Date December 3, 2012
  
Stockholders Equity Note [Line Items]  
Declaration Date Dec. 03, 2012
Per Share Dividend $ 1.000
Record Date Dec. 14, 2012
Total Amount 20,001
Payment Date Dec. 24, 2012
Declaration Date January 28, 2013
  
Stockholders Equity Note [Line Items]  
Declaration Date Jan. 28, 2013
Per Share Dividend $ 0.150
Record Date Feb. 08, 2013
Total Amount $ 3,000
Payment Date Feb. 22, 2013