Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Details 1)

v2.4.0.6
Stock Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Schedule of assumptions used to estimate the share-based compensation expense        
Weighted-average risk-free interest rate 0.70% 2.30% 0.90% 2.30%
Expected dividend payments $ 0 $ 0 $ 0 $ 0
Expected holding period (years) 5 years 5 years 4 months 24 days 5 years 1 month 6 days 5 years 4 months 24 days
Weighted-average volatility factor 1.78 1.71 1.74 1.71
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%