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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income	$ 43,440	$ 10,814	$ 74,914	$ 16,773
Adjustment for Basic EPS:
Earnings allocated to unvested shareholders	(321)	(122)	(663)	(217)
Adjusted net income	$ 43,119	$ 10,692	$ 74,251	$ 16,556
Denominator:
Weighted average common shares outstanding – Basic	46,967,005	46,868,999	46,930,165	46,826,314
Effect of dilutive shares:
Common stock equivalents arising from stock options and ESPP	495	709	994	1,237
Restricted stock awards and units and performance units	29,202	31,390	35,013	45,558
Weighted average common shares outstanding – Diluted	46,996,702	46,901,098	46,966,172	46,873,109
Basic	$ 0.92	$ 0.23	$ 1.58	$ 0.35
Diluted	$ 0.92	$ 0.23	$ 1.58	$ 0.35

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