Net Income (Loss) Per Share Schedule of Antidilutive Securities (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Potentially dilutive shares 12,061 32,576
Shares subject to outstanding common stock awards
   
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Potentially dilutive shares 12,061 15,160
Convertible preferred shares
   
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Potentially dilutive shares 0 17,416