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NET INCOME (LOSS) PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of calculation of basic and diluted earnings per common share
Basic and diluted earnings per common share are calculated as follows:

(in thousands, except for per share amounts)
 
2018
 
2017
 
2016
Basic and diluted net income (loss) per share
 
 
 
 
 
 
Net income (loss)
 
$
36,908

 
$
(102,496
)
 
$
(88,720
)
Denominator
 
63,794

 
62,702

 
61,297

Basic net income (loss) per share
 
$
0.58

 
$
(1.63
)
 
$
(1.45
)
 
 
 
 
 
 
 
Diluted net income (loss) per share
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
Net income (loss)
 
$
36,908

 
$
(102,496
)
 
$
(88,720
)
Denominator:
 
 
 
 
 
 
Denominator for basic income (loss) per share
 
63,794

 
62,702

 
61,297

Add effect of diluted securities:
 
 
 
 
 
 
Stock options and equivalents
 
414

 
—

 
—

Denominator for diluted income (loss) per share
 
$
64,208

 
$
62,702

 
$
61,297

Diluted net income (loss) per share
 
$
0.57

 
$
(1.63
)
 
$
(1.45
)
Schedule of antidilutive securities excluded from computation of diluted net income (loss) per share
The following table sets forth outstanding potential shares of common stock that are not included in the computation of diluted net income (loss) per share because, to do so would be anti-dilutive:
 
(in thousands)
 
2018
 
2017
 
2016
Convertible debt
 
17,931

 
17,931

 
17,931

Stock options and equivalents
 
3,701

 
5,618

 
3,371

Total potentially dilutive common shares
 
21,632

 
23,549

 
21,302