The following table sets forth the computation of basic and diluted income (loss) per share (in thousands, except per share amounts): | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | 2020 | | 2019 | | 2018 | | Net income (loss) | $ | (409,086) | | | $ | 40,809 | | | $ | 39,427 | | | Less: Undistributed income allocated to participating securities (1) | — | | | 438 | | | 556 | | | Net income (loss) attributable to common stockholders | (409,086) | | | 40,371 | | | 38,871 | | | Plus: Net income effect of convertible securities | — | | | — | | | — | | | Numerator for diluted income (loss) per common share | $ | (409,086) | | | $ | 40,371 | | | $ | 38,871 | | | | | | | | | Basic weighted-average common stock shares outstanding | 53,295 | | | 50,352 | | | 45,726 | | | Plus: dilutive effects of common stock equivalents (2) | — | | | 118 | | | 29 | | | Diluted weighted-average common stock shares outstanding | 53,295 | | | 50,470 | | | 45,755 | | | | | | | | | Basic income (loss) per common share | $ | (7.68) | | | $ | 0.80 | | | $ | 0.85 | | | Diluted income (loss) per common share | $ | (7.68) | | | $ | 0.80 | | | $ | 0.85 | | | | | | | | | Diluted income (loss) per common share excludes the following equity instruments because their effect would be anti-dilutive: | | | | | | | Shares of unvested restricted stock | 475 | | | 182 | | | 68 | | | Shares of stock options | 2,229 | | | 1,577 | | | 1,304 | | Common stock equivalents using the if-converted method of settling the 5.00% Convertible Senior Notes | 2,704 | | | 5,122 | | | 6,389 | |
________________________________________________________ (1)Participating securities include restricted stock that has been issued but had not yet vested. These participating securities were fully vested as of December 31, 2019. (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 common share for the year ended December 31, 2020.
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