Amount of additional stock repurchase plan authorized.

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Amount of legal and other expenses are related to repurchase offer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Price of a single share of a number of saleable stocks of a company.

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Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.

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Amount of stock repurchase plan authorized.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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SHAREHOLDERS' EQUITY (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended			36 Months Ended
	Nov. 30, 2017	May 31, 2017	Jun. 16, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2014
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 3.05	$ 2.01	$ 2.04
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options				$ 3,293
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 1 month 2 days
Stock Repurchase Program, Authorized Amount								$ 3,000
Treasury Stock, Shares				27,115,952	23,366,490		23,366,490
Additional Stock Repurchase Program Authorized Amount	$ 20,000	$ 15,000					$ 75,000
Legal And Other Expenses			$ 150
Share Repurchase Program [Member]
Class of Stock [Line Items]
Treasury Stock, Shares			3,000,000	27,115,952
Share Price			$ 4.35
Stock Redeemed or Called During Period, Value				$ 115,545
Stock Repurchased and Retired During Period, Value				$ 25,564
Stock Repurchased and Retired During Period, Shares				3,749,462
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			3,000,000
Employee and non-employee Stock Option Plan [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				1,221,941
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 1,562	$ 1,583	$ 219