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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
NET INCOME	$ 47,187	$ 21,802	$ 57,552	$ 23,751
Adjustment for Basic EPS:
Earning allocated to unvested shareholders	(727)		(972)	(32)
Adjusted net income	$ 46,460	$ 21,802	$ 56,580	$ 23,719
Denominator:
Weighted average common shares outstanding – Basic	46,742,746	46,927,543	46,702,376	46,862,199
Effect of dilutive shares:
Common stock equivalents arising from stock options and ESPP	1,450	4,051	2,324	6,914
Restricted stock awards and units and performance units	66,042	110,260	76,420	116,261
Weighted average common shares outstanding – Diluted	46,810,238	47,041,854	46,781,120	46,985,374
Basic	$ 0.99	$ 0.46	$ 1.21	$ 0.51
Diluted	$ 0.99	$ 0.46	$ 1.21	$ 0.51

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