NET INCOME (LOSS) PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
NET INCOME (LOSS) PER COMMON SHARE
Numerator: Net income (loss)	$ 6,514	$ (1,495)	$ 1,512	$ (26,077)
Denominator for basic net income (loss) per share (in shares)	56,818,883	56,039,186	56,615,359	55,794,357
Net effect of dilutive common stock equivalents (in shares)	842,000		701,000
Denominator for diluted net income (loss) per share: (in shares)	57,661,212	56,039,186	57,316,830	55,794,357
Basic net income (loss) per share (in dollars per share)	$ 0.11	$ (0.03)	$ 0.03	$ (0.47)
Diluted net income (loss) per share (in dollars per share)	$ 0.11	$ (0.03)	$ 0.03	$ (0.47)
Total number of antidilutive outstanding common stock equivalents excluded from the net income per common share computation (in shares)	4,900,000	6,000,000	5,100,000	6,000,000