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Income (Loss) Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Income (loss) per Share
Note 17—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, 347 thousand shares, and 344 thousand shares for the years ended December 31, 2017, 2016, and 2015, respectively. 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 loss per share (in thousands, except per share amounts):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Net income (loss)
$
72,621

 
$
(45,835
)
 
$
(39,911
)
Less: Undistributed income allocated to participating securities (1)
878

 
—

 
—

Net income (loss) attributable to common stockholders
71,743

 
(45,835
)
 
(39,911
)
Plus: Net income effect of convertible securities
—

 
—

 
—

Numerator for diluted income (loss) per common share
$
71,743

 
$
(45,835
)
 
$
(39,911
)
 


 


 
 
Basic weighted-average common stock shares outstanding
45,543

 
42,349

 
37,678

Add dilutive effects of common stock equivalents (2)
40

 
—

 
—

Diluted weighted-average common stock shares outstanding
45,583

 
42,349

 
37,678

 
 
 
 
 
 
Basic income (loss) per common share
$
1.58

 
$
(1.08
)
 
$
(1.06
)
Diluted income (loss) per common share
$
1.57

 
$
(1.08
)
 
$
(1.06
)
________________________________________________________
(1)
Participating securities includes 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 years ended December 31, 2016 and 2015.
For the year ended December 31, 2017, our calculation of dilutive shares outstanding excluded 65 thousand shares of unvested restricted stock, 1.3 million stock options, and 6.4 million outstanding common stock equivalents assuming our 5.00% Convertible Senior Notes had been converted on the date of issuance. For the year ended December 31, 2016, our calculation of dilutive shares outstanding excluded 451 thousand shares of unvested restricted stock, 1.3 million stock options, and 6.4 million outstanding common stock equivalents assuming our 5.00% Convertible Senior Notes had been converted on the date of issuance. For the year ended December 31, 2015, our calculation of dilutive shares outstanding excluded 535 thousand shares of unvested restricted stock and 632 thousand stock options.
As discussed in Note 11—Debt, we have the option of settling the 5.00% Convertible Senior Notes issued in June 2016 in cash or shares of common stock, or any combination thereof, upon conversion. For the year ended December 31, 2017, diluted income (loss) per share was determined using the if-converted method. We have a net loss for the year ended December 31, 2016; therefore, there is no impact for the conversion of the 5.00% Convertible Senior Notes on diluted EPS as the effect would be anti-dilutive.