NET INCOME PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 4,284	$ 5,542	$ 28,728	$ 16,166
Weighted average common shares outstanding – Basic	46,197,713	45,912,512	46,398,644	45,865,395
Common stock equivalents arising from stock options and ESPP	286,977	494,536	359,144	500,749
Restricted stock awards and units and performance units	149,073	187,795	198,640	181,424
Weighted average common shares outstanding – Diluted	46,633,763	46,594,843	46,956,428	46,547,568
Basic (in dollars per share)	$ 0.09	$ 0.12	$ 0.62	$ 0.35
Diluted (in dollars per share)	$ 0.09	$ 0.12	$ 0.61	$ 0.35
Antidilutive securities excluded from the calculation of earnings per share	48,347	111,993	334,572	188,302