Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

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EQUITY INCENTIVE PLANS (Detail Textuals 5) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Purchase Plan	Dec. 31, 2011 Purchase Plan	Dec. 31, 2010 Purchase Plan	Dec. 31, 2012 Stock Options Purchase Plan	Dec. 31, 1996 Stock Options Purchase Plan	Dec. 31, 2011 Stock Options Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of market fair value of the common stock								85.00%
Options exercises period								27 months
Increase in the aggregate number of shares									2,400,000
Number of shares purchased							1,814,967
Number of shares available for grant							585,033
Share-based compensation expense	$ 4,135	$ 3,830	$ 3,259	$ 159	$ 165	$ 248