EQUITY-BASED COMPENSATION (Schedule of Stock Option Activity) (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Options
Options outstanding at December 31, 2012	87,168
Granted
Exercised		(109,167)
Expired	(18,334)
Options outstanding and exercisable at March 31, 2013	68,834
Weighted-Average Exercise Price
Options outstanding at December 31, 2012	$ 11.23
Granted
Exercised
Expired	$ 11.32
Options outstanding and exercisable at March 31, 2013	$ 11.21
Weighted-average remaining contractual life (in years)	5 months 8 days
Aggregate intrinsic value	$ 7,025

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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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 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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