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NET INCOME (LOSS) PER COMMON SHARE - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
NET INCOME (LOSS) $ 21,802 $ (11,771) $ 23,751 $ (10,457)
Denominator [Abstract]        
Weighted average common shares outstanding – Basic 46,927,543 46,388,218 46,862,199 45,840,599
Effect of dilutive shares:        
Common stock equivalents arising from stock options and ESPP 4,051   6,914  
Restricted stock awards and units and performance units 110,260   116,261  
Weighted average common shares outstanding – Diluted 47,041,854 46,388,218 46,985,374 45,840,599
Basic (in dollars per share) $ 0.46 $ (0.25) $ 0.51 $ (0.23)
Diluted (in dollars per share) $ 0.46 $ (0.25) $ 0.51 $ (0.23)