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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 22,818	$ 13,520	$ 39,591	$ 71,072
Adjustment for Basic EPS:
Earnings allocated to unvested shareholders	(242)	(199)	(481)	(1,149)
Adjusted net income	$ 22,576	$ 13,321	$ 39,110	$ 69,923
Denominator:
Weighted average common shares outstanding – Basic	46,869,998	46,801,051	46,841,036	46,716,726
Effect of dilutive shares:
Common stock equivalents arising from stock options and ESPP	754	1,130	1,682	2,438
Restricted stock awards and units and performance units	43,801	69,539	51,050	74,265
Weighted average common shares outstanding – Diluted	46,914,553	46,871,720	46,893,768	46,793,429
Basic	$ 0.48	$ 0.28	$ 0.83	$ 1.50
Diluted	$ 0.48	$ 0.28	$ 0.83	$ 1.49

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