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Stockholders' Equity (Details)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Common Shares Reserved for Future Issuance    
Total shares of common stock reserved for issuance 6,646 8,350
Stock options outstanding under the 2009 Omnibus Incentive Compensation Plan and previous plans [Member]
    
Common Shares Reserved for Future Issuance    
Total shares of common stock reserved for issuance 4,282 4,481
Restricted stock units outstanding [Member]
    
Common Shares Reserved for Future Issuance    
Total shares of common stock reserved for issuance 1,662 1,289
Future grants of awards under the 2009 Omnibus Incentive Compensation Plan [Member]
    
Common Shares Reserved for Future Issuance    
Total shares of common stock reserved for issuance 702 1,493
Employee Stock Purchase Plan [Member]
    
Common Shares Reserved for Future Issuance    
Total shares of common stock reserved for issuance 0 1,087