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Schedule of Share-based Compensation, Stock Options, Activity (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Mar. 31, 2013
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Dec. 31, 2012
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| Beginning of Period | 1,674,065 | 1,639,842 | |
| Weighted Average Exercise Price Beginning of the Year | $ 11.37 | $ 11.46 | |
| Weighted Average Fair Value Stock Options Beginning of the Year | $ 10.74 | $ 10.85 | |
| Forfeited | (167) | ||
| Weighted Average Exercise Price Stock Options Forfeited | $ 6.30 | ||
| Weighted Average Fair Value Stock Options Forfeited | $ 5.67 | ||
| Expired | (34,056) | ||
| Weighted Average Exercise Price Stock Options Expired | $ 9.42 | ||
| Weighted Average Fair Value Stock Options Expired | $ 7.48 | ||
| End of year | 1,639,842 | 1,639,842 | |
| Weighted Average Exercise End of Year | $ 11.46 | $ 11.46 | |
| Weighted Average Fair Value Stock Options End of Year | $ 10.85 | $ 10.85 | |
| Options exercisable | 1,523,536 | 1,588,685 | |
| Weighted Average Exercise Price Options exercisable | $ 11.82 | $ 11.64 | |
| Weighted Average Fair Value Options exerciseable | $ 11.22 | $ 11.03 |
| X | ||||||||||
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- Definition
Weighted Average Fair Value Stock Options Beginning of the Year No definition available.
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| X | ||||||||||
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- Definition
Weighted Average Fair Value Stock Options End of Year No definition available.
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| X | ||||||||||
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- Definition
Weighted Average Fair Value Options exerciseable No definition available.
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| X | ||||||||||
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- Definition
Weighted Average Fair Value Stock Options Expired No definition available.
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| X | ||||||||||
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- Definition
Weighted Average Fair Value Stock Options Forfeited No definition available.
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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
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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| X | ||||||||||
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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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| 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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| X | ||||||||||
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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 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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