Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 1)

v2.4.0.6
Stock-Based Compensation (Details 1) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of weighted average assumptions to value options granted        
Grant date fair value of options $ 4.97    $ 4.91 $ 5.26
Volatility 39.70%    39.70% 39.30%
Risk-free interest rate 1.20%    1.20% 2.50%
Dividend yield 0.00%    0.00% 0.00%
Expected term (in years) 6 years 0 months    6 years 0 months 6 years 0 months