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Stock Option and Purchase Plans (Details 4) (USD $)
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12 Months Ended | ||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2012
Range One [Member]
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Dec. 31, 2012
Range Two [Member]
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Dec. 31, 2012
Range Three [Member]
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Dec. 31, 2012
Range Four [Member]
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Dec. 31, 2012
Range Five [Member]
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| Summary of weighted average exercise prices and contractual lives for outstanding and exercisable stock options | |||||||||
| Exercise Price Lower Range | $ 3.22 | $ 5.81 | $ 10.98 | $ 16.81 | |||||
| Exercise Price Upper Range | $ 4.14 | $ 8.48 | $ 12.09 | $ 29.85 | |||||
| Outstanding Shares | 1,267,730 | 1,384,538 | 1,586,860 | 1,560,158 | 335,328 | 507,567 | 119,295 | 305,540 | 1,267,730 |
| Outstanding, Weighted Average Remaining Life in Years | 1 year 7 months 6 days | 5 years 9 months 18 days | 4 years 2 months 12 days | 8 years 4 months 24 days | 5 years 2 months 12 days | ||||
| Outstanding, Weighted Average Exercise Price | $ 9.87 | $ 8.05 | $ 6.70 | $ 5.99 | $ 3.55 | $ 6.40 | $ 11.21 | $ 22.07 | $ 9.87 |
| Exercisable Shares | 973,716 | 1,067,287 | 1,196,049 | 335,328 | 398,837 | 119,295 | 120,256 | 973,716 | |
| Exercisable, Weighted Average Remaining Life in Years | 1 year 7 months 6 days | 5 years 6 months | 4 years 2 months 12 days | 7 years 2 months 12 days | 4 years 2 months 12 days | ||||
| Exercisable, Weighted Average Exercise Price | $ 8.06 | $ 6.56 | $ 5.77 | $ 3.55 | $ 6.44 | $ 11.21 | $ 22.89 | $ 8.06 | |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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