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Equity Award Plans - Narrative (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common Stock, Capital Shares Reserved for Future Issuance 6,900,000    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life of options (in years) 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share based compensation by share based payment award portion of options vesting in one year 25.00%    
Share based compensation by share based payment award portion of options vesting in equal installments over forty eight months 75.00%    
Stock Options [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life of options (in years) 4 years 6 months 5 years 4 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Annual Additional Shares Authorized, For Specific Two Year Term, As a Percent of Prior Period Shares Outstanding Balance 4.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 1,965,000