SHARE-BASED COMPENSATION - RSU Activity (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Number of Restricted Stock Units [Roll Forward]
RSUs beginning	1,481,268
RSUs awarded	298,377
RSUs released	(240,859)
RSUs forfeited	(11,749)
RSUs ending	1,527,037
Weighted Average Purchase Price RSUs	$ 0
Weighted Average Remaining Contractual Term (Years) RSUs	1 year 4 months 24 days
Aggregate Intrinsic Value RSUs	$ 11,819,266
Number of RSUs vested and expected to vest	1,401,995
Weighted Average Purchase Price of RSUs vested and expected to vest	$ 0
Weighted Average Remaining Contractual Term (Years) of RUSs vested and expected to vest	1 year 3 months 18 days
Aggregate Intrinsic Value RSUs vested and expected to vest	10,178,092
Number of RSUs exercisable	86,996
Weighted Average Purchase Price of RUSs exercisable	$ 0
Weighted Average Remaining Contractual Term (Years) of RUSs exercisable	0 years
Aggregate Intrinsic Value RSUs exercisable	673,349
Weighted average remaining recognition period in years	2 years 2 months 12 days
Unamortized compensation expense, net of estimated forfeitures	6,760,093
Other Options Disclosure [Abstract]
Intrinsic value of options exercised	537,000	84,000
Tax benefit from options exercised, before impact of valuation allowance	204,000	32,000
Cash received from exercise price of options exercised	$ 130,000	$ 54,000

Share based compensation for restricted stock units aggregate instinsic value.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Excercisable Aggregate Instrinsic Value.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercisable

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercisable Weighted Average Contractual Term.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Expected To Vest Aggregate Intrinsic Value

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Expected To Vest Contractual Term

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As of the balance sheet date, the number of Retricted Stock Units into which fully vested and expected to vest stock options outstanding can be converted under the plan.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Expected To Vest Weighted Average Purchase Price.

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Unamortized compensation expense for restricted stock units net of estimated forfeitures.

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Period over which the unamortized compensation expense will be recognized for restricted stock units.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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