STOCK-BASED COMPENSATION (Details 5) (Restricted stock units, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
The 2004 Plan
Stock-based compensation
Vesting period	4 years
Annual vesting percentage	25.00%
Number of Shares
Non-vested restricted stock units at the beginning of the period (in shares)	382,619
Granted (in shares)	438,582
Vested (in shares)	(231,686)
Forfeited (in shares)	(68,229)
Non-vested restricted stock units at the end of the period (in shares)	521,286
Weighted Average Grant Date Fair Value Per Share
Non-vested restricted stock units at the beginning of the period (in dollars per share)	$ 6.61
Granted (in dollars per share)	$ 12.69
Vested (in dollars per share)	$ 12.69
Forfeited (in dollars per share)	$ 9.32
Non-vested restricted stock units at the end of the period (in dollars per share)	$ 8.67
Weighted Average Remaining Contractual Term
Non-vested restricted stock units at the end of the period	1 year 8 months 1 day
Additional disclosures
Total fair value of awards vested	$ 2.9
The 2014 Plan
Stock-based compensation
Vesting period	4 years
Annual vesting percentage	25.00%
Number of Shares
Granted (in shares)	23,178
Non-vested restricted stock units at the end of the period (in shares)	23,178
Weighted Average Grant Date Fair Value Per Share
Granted (in dollars per share)	$ 15.53
Non-vested restricted stock units at the end of the period (in dollars per share)	$ 15.53
Weighted Average Remaining Contractual Term
Non-vested restricted stock units at the end of the period	11 months 1 day

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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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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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