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NET INCOME PER COMMON SHARE - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
NET INCOME $ 25,819 $ (1,500) $ 21,802 $ 1,949 $ 18,088 $ 7,047 $ (11,771) [1] $ 1,314 $ 48,070 $ 14,678 $ 41,854
Adjustment for basic EPS:                      
Earnings allocated to unvested securities                 (734) (138) (57)
Adjusted net income                 $ 47,336 $ 14,540 $ 41,797
Denominator:                      
Weighted average common shares outstanding – Basic                 46,408,460 46,816,394 46,252,960
Effect of dilutive shares:                      
Common stock equivalents arising from stock options and ESPP                 5,398 267,145 265,129
Restricted stock awards and units and performance units                 122,122 410,649 167,056
Weighted average common shares outstanding – Diluted                 46,535,980 47,494,188 46,685,145
Basic $ 0.55 $ (0.03) $ 0.46 $ 0.04 $ 0.39 $ 0.15 $ (0.25) $ 0.03 $ 1.02 $ 0.31 $ 0.90
Diluted $ 0.55 $ (0.03) $ 0.46 $ 0.04 $ 0.39 $ 0.15 $ (0.25) $ 0.03 $ 1.02 $ 0.31 $ 0.90
[1] Includes a $33.0 million write down of inventory