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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Net income $ 32,813 $ 13,520 $ 47,187 $ 10,365 $ 25,819 $ (1,500) $ 21,802 $ 1,949 $ 103,885 $ 48,070 $ 14,678
Adjustment for Basic EPS:                      
Earnings allocated to unvested shareholders                 (1,638) (734) (138)
Adjusted net income                 $ 102,247 $ 47,336 $ 14,540
Denominator:                      
Weighted average common shares outstanding – Basic                 46,725,289 46,408,460 46,816,394
Effect of dilutive shares:                      
Common stock equivalents arising from stock options and ESPP                 2,611 5,398 267,145
Restricted stock awards and units and performance units                 77,294 122,122 410,649
Weighted average common shares outstanding – Diluted                 46,805,194 46,535,980 47,494,188
Basic $ 0.70 $ 0.28 $ 0.99 $ 0.22 $ 0.55 $ (0.03) $ 0.46 $ 0.04 $ 2.19 $ 1.02 $ 0.31
Diluted $ 0.69 $ 0.28 $ 0.99 $ 0.22 $ 0.55 $ (0.03) $ 0.46 $ 0.04 $ 2.18 $ 1.02 $ 0.31