Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Details 1)

v2.4.0.8
Stock Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Schedule of assumptions used to estimate the share-based compensation expense    
Weighted-average risk-free interest rate 2.00% 0.64%
Expected dividend payments $ 0 $ 0
Expected holding period (years) 6 years 6 months [1] 4 years 4 months 24 days [1]
Weighted-average volatility factor 1.66 [2] 1.83 [2]
Estimated forfeiture rates for options granted to management 31.00% [3] 23.00% [3]
Estimated forfeiture rates for options granted to non-management 31.00% [3] 41.00% [3]
[1] Expected holding periods are based on the simplified method provided in Staff Accounting Bulletin No. 107 for “plain vanilla options.”
[2] Weighted average volatility is based on the historical volatility of our common stock.
[3] Estimated forfeiture rates are based on historical data.