Annual report pursuant to Section 13 and 15(d)

Stock Plans (Details 2)

v2.4.0.8
Stock Plans (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of assumptions used to estimate the share-based compensation expense      
Weighted-average risk-free interest rate 0.92% 0.91% 2.30%
Expected dividend payments $ 0 $ 0 $ 0
Expected holding period (years) 3 years 10 months 24 days [1] 5 years 1 month 6 days [1] 5 years 4 months 24 days [1]
Weighted-average volatility factor 1.38 [2] 1.75 [2] 1.71 [2]
Estimated forfeiture rates for options granted to management 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]
[1] Expected holding period is based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and the expectations of future employee behavior.
[2] Weighted average volatility is based on the historical volatility of our common stock.
[3] Estimated forfeiture rates are based on historical data.