Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Details 1)

v2.4.0.8
Stock Plans (Details 1) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Schedule of assumptions used to estimate the stock-based compensation expense        
Weighted-average risk-free interest rate 1.00% 0.70% 0.80% 0.90%
Expected dividend payments            
Expected holding period (years) 3 years 10 months 24 days 5 years 4 years 2 months 12 days 5 years 1 month 6 days
Weighted-average volatility factor 1.56 1.78 1.70 1.74
Estimated forfeiture rates for options granted to management 23.00% 23.00% 23.00% 23.00%
Estimated forfeiture rates for options granted to non-management 41.00% 41.00% 41.00% 41.00%