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Common Stock (Details) (USD $)
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3 Months Ended | |
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Mar. 31, 2013
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Mar. 31, 2012
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| Summary of stock options activity | ||
| Number of Optioned Common Shares, Beginning Balance | 804,781 | |
| Weighted Average Exercise Price, Beginning Balance | $ 11.34 | |
| Number of Optioned Common Shares, Option grants | 182,182 | |
| Weighted Average Exercise Price, Option grants | $ 11.97 | |
| Number of Optioned Common Shares, Option expirations | (3,061) | |
| Weighted Average Exercise Price, Option expirations | $ 4.11 | |
| Number of Optioned Common Shares, Option exercises | (3,475) | 300 |
| Weighted Average Exercise Price, Option exercises | $ 3.00 | |
| Number of Optioned Common Shares, Option forfeitures | (200) | |
| Weighted Average Exercise Price, Option forfeitures | $ 14.49 | |
| Number of Optioned Common Shares, Ending Balance | 980,227 | |
| Weighted Average Exercise Price, Ending Balance | $ 11.51 | |
| X | ||||||||||
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- Definition
Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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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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- Details
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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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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded. No definition available.
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| X | ||||||||||
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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