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Income (Loss) Per Share | 12 Months Ended
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Dec. 31, 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 for each of the years ended December 31, 2019, 2018, and 2017. 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 per share (in thousands, except per share amounts):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Net Income | $ | 40,809 |  |  | $ | 39,427 |  |  | $ | 72,621 |
Less: Undistributed income allocated to participating securities (1) | 438 |  |  | 556 |  |  | 878 |
Net income attributable to common stockholders | 40,371 |  |  | 38,871 |  |  | 71,743 |
Plus: Net income effect of convertible securities | — |  |  | — |  |  | — |
Numerator for diluted income per common share | $ | 40,371 |  |  | $ | 38,871 |  |  | $ | 71,743 |
Basic weighted-average common stock shares outstanding | 50,352 |  |  | 45,726 |  |  | 45,543 |
Plus: dilutive effects of common stock equivalents | 118 |  |  | 29 |  |  | 40 |
Diluted weighted-average common stock shares outstanding | 50,470 |  |  | 45,755 |  |  | 45,583 |
Basic income per common share | $ | 0.80 |  |  | $ | 0.85 |  |  | $ | 1.58 |
Diluted income per common share | $ | 0.80 |  |  | $ | 0.85 |  |  | $ | 1.57 |
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(1) | Participating securities includes restricted stock that has been issued but has not yet vested.
For the year ended December 31, 2019, our calculation of diluted shares outstanding excluded 182 thousand shares of unvested restricted stock and 1.6 million stock options. For the year ended December 31, 2018, our calculation of diluted shares outstanding excluded 68 thousand shares of unvested restricted stock and 1.3 million stock options. For the year ended December 31, 2017, our calculation of diluted shares outstanding excluded 65 thousand shares of unvested restricted stock and 1.3 million stock options. As discussed in Note 12—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 years ended December 31, 2019, 2018, and 2017, diluted income per share was determined using the if-converted method. Our calculation of diluted shares outstanding for years ended December 31, 2019, 2018, and 2017 excluded 5.1 million, 6.4 million, and 6.4 million common stock equivalents, respectively, as the effect would be anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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