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Stock Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified |
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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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Shares of common stock authorized under stock compensation plan | 8,950,000 | ||
| Remaining shares available for grant | 1,426,505 | ||
| Total intrinsic value of options exercises | $ 5.4 | $ 1.4 | $ 0.8 |
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Performance based awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Vesting period for non-vested stock awards and stock options | 3 years | ||
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Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Vesting period for non-vested stock awards and stock options | 3 years | ||
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Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Vesting period for non-vested stock awards and stock options | 5 years | ||
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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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- Details
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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