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Income (Loss) per Share
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Income (Loss) per Share Income (Loss) per Share
Basic income (loss) per share is computed by dividing net income (loss) attributable to common stockholders by the sum of the weighted-average number of common shares outstanding and the weighted-average number of shares issuable under the common stock warrants, representing 354 thousand shares during each of the three and nine months ended September 30, 2019 and September 30, 2018. The common stock warrants are included in the calculation of basic income (loss) per share because they are issuable for minimal consideration. The following table sets forth the computation of basic and diluted income (loss) per share (in thousands, except per share amounts):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Net income (loss)
$
(83,891
)
 
$
(5,822
)
 
$
5,370

 
$
25,541

Less: Undistributed income allocated to participating securities (1)
—

 
—

 
59

 
361

Net income (loss) attributable to common stockholders
(83,891
)
 
(5,822
)
 
5,311

 
25,180

Plus: Net income effect of convertible securities
—

 
—

 
—

 
—

Numerator for diluted income (loss) per common share
$
(83,891
)
 
$
(5,822
)
 
$
5,311

 
$
25,180

 
 
 
 
 
 
 
 
Basic weighted-average common stock shares outstanding
50,942

 
45,709

 
49,973

 
45,676

Plus: dilutive effects of common stock equivalents (2)
—

 
—

 
98

 
45

Diluted weighted-average common stock shares outstanding
50,942

 
45,709

 
50,071

 
45,721

 
 
 
 
 
 
 
 
Basic income (loss) per common share
$
(1.65
)
 
$
(0.13
)
 
$
0.11

 
$
0.55

Diluted income (loss) per common share
$
(1.65
)
 
$
(0.13
)
 
$
0.11

 
$
0.55

________________________________________________________
(1)
Participating securities include restricted stock that has been issued but has not yet vested.
(2)
Entities with a net loss from continuing operations are prohibited from including potential common shares in the computation of diluted per share amounts. We have utilized the basic shares outstanding to calculate both basic and diluted loss per share for the three months ended September 30, 2019 and 2018.
For the nine months ended September 30, 2019, our calculation of diluted shares outstanding excluded 160 thousand shares of restricted stock and 1.8 million stock options. For the nine months ended September 30, 2018, our calculation of diluted shares outstanding excluded 33 thousand shares of restricted stock and 1.3 million stock options.
As discussed in Note 9—Debt, we have the option of settling the 5.00% Convertible Senior Notes in cash or shares of common stock, or any combination thereof, upon conversion. For the three and nine months ended September 30, 2019 and September 30, 2018, diluted income (loss) per share was determined using the if-converted method. Our calculation of diluted shares outstanding for the three and nine months ended September 30, 2019 and the three and nine months ended September 30, 2018 excluded 4.4 million, 5.5 million, 6.4 million, and 6.4 million common stock equivalents, respectively, as the effect would be anti-dilutive.