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NET (LOSS) INCOME PER SHARE
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
NET (LOSS) INCOME PER SHARE
NET (LOSS) INCOME PER SHARE
 
Basic net (loss) income per share is calculated by dividing the net (loss) income by the weighted-average number of shares of common stock outstanding during the period. Diluted net (loss) income per share is calculated by dividing the net income by the weighted-average number of shares of common stock outstanding during the period, plus potentially dilutive common shares, consisting of stock options and convertible debt. The Company uses the treasury-stock method to compute diluted earnings per share with respect to its stock options and equivalents. The Company uses the if-converted method to compute diluted earnings per share with respect to its convertible debt. For purposes of this calculation, options to purchase stock are considered to be potential common shares and are only included in the calculation of diluted net (loss) income per share when their effect is dilutive. 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
)

 
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