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NET INCOME PER COMMON SHARE - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income $ 13,520 $ (1,500) $ 71,072 $ 22,251
Adjustment for Basic EPS:        
Earning allocated to unvested shareholders (199)   (1,149)  
Adjusted net income $ 13,321 $ (1,500) $ 69,923 $ 22,251
Denominator:        
Weighted average common shares outstanding – Basic 46,801,051 46,947,621 46,716,726 46,889,913
Effect of dilutive shares:        
Common stock equivalents arising from stock options and ESPP 1,130   2,438 5,948
Restricted stock awards and units and performance units 69,539   74,265 119,401
Weighted average common shares outstanding – Diluted 46,871,720 46,947,621 46,793,429 47,015,262
Basic $ 0.28 $ (0.03) $ 1.50 $ 0.47
Diluted $ 0.28 $ (0.03) $ 1.49 $ 0.47