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Stockholders' Equity (Details) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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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

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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