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NET (LOSS) INCOME PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net (loss) income $ (11,771) $ 20,422 $ (10,457) $ 24,443
Denominator [Abstract]        
Weighted average common shares outstanding – Basic 46,388,218 46,266,142 45,840,599 46,222,146
Common stock equivalents arising from stock options and ESPP 0 249,618 0 262,434
Restricted stock awards and units and performance units 0 98,966 0 148,402
Weighted average common shares outstanding – Diluted 46,388,218 46,614,726 45,840,599 46,632,982
Basic (in dollars per share) $ (0.25) $ 0.44 $ (0.23) $ 0.53
Diluted (in dollars per share) $ (0.25) $ 0.44 $ (0.23) $ 0.52
Antidilutive securities excluded from the calculation of earnings per share 947,442 232,245 947,442 286,225