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NET INCOME (LOSS) PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Net (loss) income $ 7,047 $ 4,284 $ (3,410) $ 28,728
Denominator [Abstract]        
Weighted average common shares outstanding – Basic 46,542,556 46,197,713 46,241,578 46,398,644
Common stock equivalents arising from stock options and ESPP 90,398 286,977 0 359,144
Restricted stock awards and units and performance units 90,419 149,073 0 198,640
Weighted average common shares outstanding – Diluted 46,723,373 46,633,763 46,241,578 46,956,428
Basic (in dollars per share) $ 0.15 $ 0.09 $ (0.07) $ 0.62
Diluted (in dollars per share) $ 0.15 $ 0.09 $ (0.07) $ 0.61
Antidilutive securities excluded from the calculation of earnings per share 1,000 48,347 356,045 334,572