Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Stock Option Assumptions) (Details)

v2.4.0.6
Stockholders' Equity (Stock Option Assumptions) (Details) (Employee Stock Option [Member], Stock Options [Member])
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Stock Option [Member] | Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average expected life (years) 6 years 6 years 1 month 6 days 6 years 6 months
Weighted-average expected volatility (percent) 61.00% 58.00% 73.00%
Weighted-average risk free interest rate (percent) 1.00% 2.20% 2.60%
Expected dividend yield (percent) 0.00% 0.00% 0.00%