XML 14 R39.htm IDEA: XBRL DOCUMENT v2.4.0.6
Net Income Per Share - Reconciliation of the numerators and denominators of the basic and diluted net income per share computations (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Net income (numerator):                      
Net income $ 4,602 $ 4,577 $ 4,034 $ 3,952 $ 3,993 $ 3,898 $ 3,930 $ 4,837 $ 17,165 $ 16,659 $ 20,871
Shares (denominator):                      
Weighted average number of common shares outstanding used in basic computation                 19,926 20,613 22,514
Common shares issuable upon exercise of stock options and vesting of restricted stock                 113 85 119
Common shares issuable upon conversion of preferred shares                 10 10 10
Shares used in diluted computation                 20,049 20,708 22,643
Net income per common share:                      
Basic (in dollars per share)                 $ 0.86 $ 0.81 $ 0.93
Diluted (in dollars per share) $ 0.23 $ 0.23 $ 0.20 $ 0.20 $ 0.20 $ 0.19 $ 0.19 $ 0.22 $ 0.86 $ 0.80 $ 0.92