NET INCOME (LOSS) PER SHARE (Tables)

12 Months Ended

Dec. 31, 2017

NET INCOME (LOSS) PER SHARE

Schedule of calculation of basic and diluted earnings per common share

(in thousands, except for per share amounts)	2017		2016		2015
Basic and diluted net loss per share
Net loss	$	(102,496)	$	(88,720)	$	(75,738)
Denominator		62,702		61,297		60,117
Basic and diluted net loss per share	$	(1.63)	$	(1.45)	$	(1.26)

Schedule of antidilutive securities excluded from computation of diluted net income (loss) per share

(in thousands)	2017	2016	2015
Convertible debt	17,931	17,931	17,931
Stock options and equivalents	5,618	3,371	1,490
Total potentially dilutive common shares	23,549	21,302	19,421