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Stockholders' Equity - Shares Reserved For Future Issuance (Details)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 02, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Options Outstanding 2,213,000 1,661,000 735,000  
Shares Reserved For Future Issuance 11,400,000 8,546,000 10,287,000  
Common Stock Warrants 23,000 23,000 65,000  
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding Awards Other Than Option 1,762,000 1,775,000 3,426,000  
Performance Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding Awards Other Than Option 183,000 0 0  
2010 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Available for Future Grant 3,959,000 4,508,000 5,061,000  
Shares Reserved For Future Issuance       4,666,666
Employee Stock Purchase Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Reserved For Future Issuance 3,260,000 579,000 1,000,000