Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Details 1)

v2.4.0.6
Stock Plans (Details 1) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of assumptions used to estimate the share-based compensation expense    
Weighted-average risk-free interest rate 0.64% 0.94%
Expected dividend payments      
Expected holding period (years) 4 years 4 months 24 days 5 years 1 month 6 days
Weighted-average volatility factor 1.83 1.74
Estimated forfeiture rates for options granted to management 23.00% 23.00%
Estimated forfeiture rates for options granted to non-management 41.00% 41.00%