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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net income $ 40,500 $ 36,962 $ 79,470 $ 111,876
Adjustment for Basic EPS:        
Earnings allocated to unvested shareholders (277) (260) (613) (922)
Adjusted net income $ 40,223 $ 36,702 $ 78,857 $ 110,954
Denominator:        
Weighted average common shares outstanding – Basic 47,227,061 46,980,439 47,182,625 46,947,109
Effect of dilutive shares:        
Common stock equivalents arising from stock options and ESPP 339 249 1,263 1,142
Restricted stock awards and units and performance units 32,931 33,231 28,772 35,650
Weighted average common shares outstanding – Diluted 47,260,331 47,013,919 47,212,660 46,983,901
Basic $ 0.85 $ 0.78 $ 1.67 $ 2.36
Diluted $ 0.85 $ 0.78 $ 1.67 $ 2.36