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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, NET INCOME (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share 73 56 73 56
Numerator: [Abstract]        
Net income (loss) $ 23,201 $ (5,362) $ 55,498 $ (26,455)
Denominator: [Abstract]        
Denominator for basic net income (loss) per share - weighted-average outstanding shares (in shares) 32,186 31,980 32,152 31,934
Effect of dilutive securities: [Abstract]        
Stock options and restricted stock 254 0 271 0
Denominator for diluted net income (loss) per share - weighted-average outstanding shares (in shares) 32,440 31,980 32,423 31,934
Net income (loss) per share - basic (in dollars per share) $ 0.72 $ (0.17) $ 1.73 $ (0.83)
Net income (loss) per share - diluted (in dollars per share) $ 0.72 $ (0.17) $ 1.71 $ (0.83)
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share 89   184  
Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share 72 55 72 55
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share 1 1 1 1