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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Weighted-average risk-free interest rate 0.90% 0.90% 0.90% 0.90%
Expected dividend payments $ 0 $ 0 $ 0 $ 0
Expected holding period (years) 3 years 9 months 18 days [1] 5 years 1 month 6 days [1] 4 years [1] 5 years 1 month 6 days [1]
Weighted-average volatility factor 1.05% [2] 1.74% [2] 1.48% [2] 1.74% [2]
Estimated forfeiture rates for options granted to management 23.00% [3] 23.00% [3] 23.00% [3] 23.00% [3]
Estimated forfeiture rates for options granted to non-management 41.00% [3] 41.00% [3] 41.00% [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.