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NET INCOME PER COMMON SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income	$ 31,474	$ 5,959
Adjustment for Basic EPS:
Earnings allocated to unvested shareholders	(325)	(87)
Adjusted net income	$ 31,149	$ 5,872
Denominator:
Weighted average common shares outstanding – Basic	46,892,914	46,783,158
Effect of dilutive shares:
Common stock equivalents arising from stock options and ESPP	800	837
Restricted stock awards and units and performance units	38,285	64,803
Weighted average common shares outstanding – Diluted	46,931,999	46,848,798
Basic	$ 0.66	$ 0.13
Diluted	$ 0.66	$ 0.13

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