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Description of Equity Incentive Plans (Details)
Dec. 31, 2012
Equity Incentive Plan 2005 [Member]
Dec. 31, 2011
Equity Incentive Plan 2005 [Member]
Aug. 15, 2005
Equity Incentive Plan 2005 [Member]
Dec. 31, 2012
Equity Incentive Plan 2007 [Member]
Dec. 31, 2011
Equity Incentive Plan 2007 [Member]
Jun. 28, 2011
Equity Incentive Plan 2007 [Member]
Jul. 09, 2007
Equity Incentive Plan 2007 [Member]
Equity Incentive Plans [Line Items]              
Awards authorized and reserved under plan     14,000,000     15,300,000 9,000,000
Stock options outstanding under plan 900,000 1,000,000          
Stock options, RSAs, and RSUs outstanding under plan       3,500,000 3,600,000    
Number of shares available for future issuance under plan 0     5,700,000