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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Tax Disclosure [Abstract]        
Income tax provision $ 2,356 $ 2,286 $ 4,667 $ 5,099
Effective tax rates     36.90% 36.80%