NET INCOME (LOSS) PER COMMON SHARE NET INCOME (LOSS) PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income	$ 1,314us-gaap_NetIncomeLoss	$ 4,022us-gaap_NetIncomeLoss
Denominator [Abstract]
Weighted average common shares outstanding – Basic	45,785,725	46,177,661
Effect of dilutive shares:
Restricted stock awards and units and performance units	264,743	198,385
Common stock equivalents arising from stock options and ESPP	163,779	275,392
Weighted average common shares outstanding – Diluted	46,214,247	46,651,438
Basic (in dollars per share)	$ 0.03us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted
Antidilutive securities excluded from calculation of diluted EPS	37,132	53,890

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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