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NET (LOSS) INCOME PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2019
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):

 
 
Year ended December 31,
 
 
2019
 
2018
 
2017
Basic net income (loss) per share
 
 
 
 
 
 
Net (loss) income
 
$
(217,201
)
 
$
36,908

 
$
(102,496
)
Weighted average common shares outstanding
 
70,716

 
63,794

 
62,702

Basic net (loss) income per share
 
$
(3.07
)
 
$
0.58

 
$
(1.63
)
 
 
 
 
 
 
 
Diluted net income (loss) per share
 
 
 
 
 
 
Net (loss) income
 
$
(217,201
)
 
$
36,908

 
$
(102,496
)
Weighted average common shares outstanding
 
70,716

 
63,794

 
62,702

Add: effect of dilutive securities
 
—

 
414

 
—

Denominator for diluted income (loss) per share
 
70,716

 
64,208

 
62,702

Diluted net (loss) income per share
 
$
(3.07
)
 
$
0.57

 
$
(1.63
)
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):

 
 
Year ended December 31,
 
 
2019
 
2018
 
2017
2.5% Convertible Notes due 2021
 
13,895

 
17,931

 
17,931

5.0% Convertible Notes due 2024
 
14,895

 
—

 
—

Stock options and equivalents
 
6,486

 
3,701

 
5,618

Total potentially dilutive common shares
 
35,276

 
21,632

 
23,549