Additional number of shares available for grant.

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Number of shares of restricted stock issued to each non-employee director

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- Definition

Percentage of exercise price per share for stock options issued to closing price of a share of common stock

+ References

No definition available.

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- Definition

Percentage of restricted stock awards granted to directors vest on the fifth anniversary

+ References

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Percentage of shares vested

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- Definition

Percent Vested Each Year.

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- Definition

Share based compensation arrangement by share based payment award maximum number of shares per non employee director

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Revised Number Of Shares Available For Grant

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No definition available.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

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- Definition

General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB

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-Paragraph A240

-Subparagraph b(2)(c)

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- Definition

The weighted average period between the balance sheet date and expiration for equity-based awards other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan), which may be expressed in a decimal value for number of years.

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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).

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-Publisher FASB

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-Paragraph A240

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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.

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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.

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-Publisher FASB

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- Definition

Sets forth the nature of any other increase or decrease in the number of shares reserved for issuance under the option plan.

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- Definition

The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options that are exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

+ References

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- Definition

Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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-Publisher FASB

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Stock Benefit Plan (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award description	The grant of any full value awards (awards other than stock options or stock appreciation rights) is deemed, for purposes of determining the number of shares available under the 2011 Plan, as an award of 4.28 shares of common stock for each share of common stock subject to the award. Any forfeitures or cancellations of awards will be returned to the reserved pool under the 2011 Plan in the same manner.
Terms and provisions applicable to an award granted	Options granted under the 2011 Plan and the 2008 Plan during the years 2011, 2010 and 2009, vest 20% for each year of service until 100% vested on the fifth anniversary and expire after ten years from the date of grant.
Percentage of exercise price per share for stock options issued to closing price of a share of common stock	100.00%
Percent vested each year	20.00%
Weighted average expected option lives, for both employee and director options, in years	10
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeitures or cancellations of awards	20,876
Awards reduction description	Stock options awarded reduced the number of shares available for awards by one share for every one share granted.
Number of options issued to each non-employee Director, maximum	6,000
Unvested Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeitures or cancellations of awards	20,876
Total unrecognized compensation cost related to unvested stock	2,035
Weighted average period of unvested stock that is expected to be recognized, in years	1.72
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards reduction description	Awards of restricted stock reduced the number of shares available for award by one share for every one share awarded, up to 250,000; beyond that, restricted stock reduced the number of shares available for award by 3.5 shares for every one share awarded.
Number of shares of restricted stock issued to each non-employee Director	2,000
Percentage of restricted stock awards granted to directors vest on the fifth anniversary	100.00%
Number of restricted shares granted	97,377
Total unrecognized compensation cost related to unvested stock	5,781
Weighted average period of unvested stock that is expected to be recognized, in years	2.33
2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to issue	3,000,000
Additional number of shares available for grant	515,340
Revised number of shares available for grant	2,450,000
2011 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	2,931,962
Forfeitures or cancellations of awards	206
Employee Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	87,913	108,252	114,078
Percentage of shares vested	25.00%
Shares vesting period (years)	four
Employee Awards [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	87,913	108,252	114,078
Employee Awards [Member] \| 2000 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	350,702
Employee Awards [Member] \| 2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	96,822
Employee Awards [Member] \| 2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	290,131
Employee Awards [Member] \| 2011 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	87,913
Non-Employee Director Awards [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	9,464	12,760	14,769
Non-Employee Director Awards [Member] \| 2000 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	2,700
Non-Employee Director Awards [Member] \| 2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	28,935
Non-Employee Director Awards [Member] \| 2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	36,313
Non-Employee Director Awards [Member] \| 2011 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	9,464
Stock Appreciation Rights [Member] \| 2011 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	1