STOCK-BASED COMPENSATION (Details 3) (Stock options, USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2013
Stock options
Stock options, Shares
Outstanding at the beginning of the period (in shares)	1,072,503
Exercised (in shares)	(27,029)
Expired (in shares)	(1,737)
Outstanding at the end of the period (in shares)	1,043,737
Options exercisable at the end of the period (in shares)	892,445
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 8.97
Exercised (in dollars per share)	$ 7.79
Expired (in dollars per share)	$ 11.63
Outstanding at the end of the period (in dollars per share)	$ 8.99
Options exercisable at the end of the period (in dollars per share)	$ 9.35
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period	5 years
Options exercisable at the end of the period	4 years 5 months 19 days
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period	$ 18,020
Options exercisable at the end of the period	$ 15,092

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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.

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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.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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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.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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