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NET INCOME PER COMMON SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ 815	$ 43,440	$ 38,970	$ 74,914
Adjustment for Basic EPS:
Earnings allocated to unvested shareholders	(6)	(321)	(318)	(663)
Adjusted net income	$ 809	$ 43,119	$ 38,652	$ 74,251
Denominator:
Weighted average common shares outstanding – Basic	47,227,294	46,967,005	47,160,163	46,930,165
Effect of dilutive shares:
Common stock equivalents arising from stock options and ESPP	483	495	924	994
Restricted stock awards and units and performance units	16,214	29,202	29,418	35,013
Weighted average common shares outstanding – Diluted	47,243,991	46,996,702	47,190,505	46,966,172
Basic	$ 0.02	$ 0.92	$ 0.82	$ 1.58
Diluted	$ 0.02	$ 0.92	$ 0.82	$ 1.58

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