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Stockholders' Equity and Employee Stock Option Plans 1997 Stock Plan (Details)
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12 Months Ended | |||||
|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Apr. 01, 2013
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Mar. 31, 2013
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Dec. 31, 2010
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| 1997 Stock Plan [Abstract] | ||||||
| Common Stock, Capital Shares Reserved for Future Issuance | 10,123,801 | 10,905,404 | 20,972,838 | |||
| Options and SARS, Outstanding, Number | 4,104,849 | 3,939,315 | 3,103,472 | 5,505,404 | 4,275,648 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Additional Shares Authorized in 2013 Amendment | 5,400,000 | |||||
| Number of Additional Shares Authorized | 7,122,039 | 1,700,859 | 1,679,692 | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 4,650,855 | 13,467,582 | 13,047,736 | 15,467,434 | 11,420,522 | |